Product Reviewed: SAE 0W-20 Signature Series 100% Synthetic Motor Oil (ASM)
Current Rating: 4.97 out of 5 stars
Votes & Reviews: 407 vote(s) and 1145 user reviews.
Reviewed by Railrunner: 
I have been using Amsoil products in my vehicles and motorized equipment for many years and relay on its quality. As a "gearhead", I know how important using quality motor oils and greases are to machinery. They are my first choice for lubrication fluids.
Reviewed by K-Mac:
I only use American AMSOIL in all my vehicles. For this one, I use it in my 2005 Honda Fit 1500cc..
Reviewed by K-Mac:
I only use American AMSOIL in all my vehicles. For this one, I use it in my 2016 Nissan Caravan NV350.
Reviewed by Jeff:
I run Amsoil oil and filter in my Yukon Denali 15,000 miles between changes. Just reset the change oil message at 7500. Doing this for years with several GMC Yukon's. At 250,000 plus miles no oil burn at all. Very impressed with not having to go under the car twice as much.
Reviewed by Ricky:
Awesome cold start protection, and anti-wear lube, simply the best
Reviewed by Mustang Larry:
So far all is good.
Reviewed by Mustang Larry:
Why is it when I change my oil does my mileage drop by 2mpg. For the first 400 miles 1 1/2 to 2 mpg less then it creeps back up.
Reviewed by Ron the Tyrolian:
I have relied on Amsoil products for years to protect my engines and it has done exactly that.
Reviewed by SamLac:
I started using AMSoil in the mid 80s while in Alaska. Cold extreme make lubrication very critical. At minus 40, most petroleum lubes won't even drip off the dip stick and when started cold you can hear every bearing in the engine as there is little or no lube flowing. No so with my AMSoil.
Reviewed by Jeff:
I've been running 5W30 Signature Series in my 2002 Tacoma since putting it on the road in 2016 with 116,000 miles on the engine. I have since had Oil Analyzers (Amsoil, Inc.) test three samples from the truck so far, and have yet to have the oil last more than 13K miles before being told it's time for it to be changed. So much for the 25,000 miles/1 year claim...
Reviewed by Grizz:
I have 2 vehicles that have had this oil in them (changed every 15,000mi) since I bought them new. They both have mileage approaching 250,000, and they run like BRAND NEW. My newest vehicle is a 2017 Subie Forester Turbo so it gets Signature 5W-30 every 10,000 miles, and I'm sure it will see 200k and beyond.
Reviewed by GF1563:
Love the extended oil change intervals and my fuel mileage increased slightly, which leads me to believe it must be lubricating everything very well.
Reviewed by Pat:
It's great year round hot or cold
Reviewed by Don:
Several years ago I switched to Amsoil in my GMC Yukon. I was very impressed with what the Signature Series 5w-30 Motor Oil looked like after the first oil change. With all the oils and products that Amsoil offers, I have since switched everything I own over to Amsoil. Even my lawnmowers.
Reviewed by dhgguy:
Used in my F150 exclusively. Excellent oil & filter.
Would not use anything else.
Reviewed by Ronv:
I have used Amsoil for 30 years and wouldn't think of using any other oil.
Reviewed by Mister nice:
Love that you don't have to change oil as offer as regular oil. Is is a little high. Hey but you get what you pay for.
Reviewed by Henry:
I use Amsoil exclusively
Reviewed by Jblev77:
#1 for 3.5L ecoboost
Reviewed by Ed:
I like being about to change oil at any time between 5-10k and not have to worry about weather or not the oil is doing it job !!!
Reviewed by RebelnOhio:
I have been using Amsoil for over 15 years and have never had a problem, it's a well proven product that I trust in all of my cars for work and for pleasure. I will will continue to use Amsoil and benefit from it's proven results! I own a Livery/Limo Service and I drive about 40-50K miles a year on various cars and I believe Amsoil is the best Oil for all of my vehicles. With the long 15k Mile change intervals it is a money saving gem and your engine benefits 100%. I recommend there products highly!
Reviewed by KENT:
I've used this brand and series in my Dodge Ram 4.7 v-8 since I acquired it at 90,000 miles. I've driven another 70,000 miles since and the engine is stronger than it's ever been! I expect to drive this truck until at least 300K miles because of the Amsoil Signagture Series Synthetic brand motor oil. I won't use anything else!
Reviewed by KK:
I use Amsoil on my SUV and love it!
Reviewed by Tom:
I use ansoil on all of my trucks, motorcycles, ATVs. This oil I use on 2017 Hemi 2500. It cannot be beat.
Reviewed by G:
Instant satisfaction, after the first start up i could already hear and feel things running smoother.
Reviewed by Redtundra8:
This is the best oil money can buy in my opinion. I use this in all my vehicles and have for the last 12 years. Love only having to change the oil once a year. I highly recommend this product.
Reviewed by Pat:
Bestboil products on the market by far. I run it in all my vehicles
Reviewed by Billy G:
I have used Amsoil products for many years in all of my vehicles and small engines. I have never had an issues. I recommend Amsoil even though it is not the cheapest but the delivery is very prompt.
Reviewed by Wingsprnt:
Not sure about the oW-20 weight here in Florida, but that is what Honda calls for.
Reviewed by Greg:
Always met my expectations.
Reviewed by MatsB:
Using Amsoil in all of my family's cars. Using Signature series in cars that drive over 12,000 miles per year, and XL series in cars that drive less than 12,000
miles.
Sent a 27,000 mile sample for testing to a independent lab, and they recommended 30,000 miles next time based on the excellent results.
Also using Amsoil in all lawn equipment and for a standby generator.
Reviewed by
Robert Long:
Great product gives better fuel mileage and cleaner oil after changes
Reviewed by Tim:
I've been using Amsoil since the 1980s in everything with an engine. And have bragged about it's benefits to anyone who'd listen.
Reviewed by Rob:
I get better mileage with Amsoil
I run my 4x4 very hard and Amsoil is doing a great job of keeping it running strong
Reviewed by Elvis of Aragorn:
My 2004 Silverado (5.3L V8) has had a steady diet of Amsoil since its second oil change. I have stuck to the 10,000 mile interval, using Amsoil Ea filters & Signature Oil. She's about to roll over the 200,000 mile mark, and I have had no engine issues. I use Amsoil Signature Synthetic Oil in all of my vehicles, and plan on keeping it that way.
Reviewed by Pinto:
I'm city driving in a 4x4 Ford van and after my last oil change the oil was still in great condition after 15,000 miles. just used the cleaning solution so lets see how this improves engine longevity. really happy with all th products I have received.
Reviewed by S2kadi:
I use Amsoil Signature Series in both of my cars that are susceptible to burning oil. The 10W30 goes into my Honda S2000 and works great! Amsoil is the only oil I use in my motors and gearboxes, after trying out several different brands, I have found their quality to be of the best.
Reviewed by pro4100:
I use it in my Subie Forester and my silverado 1500. no problems ever!
Reviewed by Quick charge
water:
Yeah like to 25,000 my old changed
Reviewed by Beast:
I will never use conventional again. 10K mile Oil changes, or once a year. You cant beat the quality and value of this product. No dealer or mechanic can ever persuade my to change every 3k miles again!. Get you some!
Reviewed by Astrofan:
I personally believe that with the history of Amsoil and their pioneering spirit I am getting the absolute best product on the market. They have been doing this longer and better than anyone else for a long time.
Can't beat the best!
Reviewed by Ber:
More mpg and better engine protection for all my engines
Reviewed by ScoobyVTEC:
Bought Amsoil for all of my cars so I wouldn't have to change the oil so frequently and for the protection it gives all of the internal moving parts. I've noticed an increase in MPG and smoothness when I drive.
2017 Civic Type R
2012 Pilot Touring AWD
1998 Civic EX
Reviewed by Bob:
I use this product in my Nissan Altima. I took the car to the shop for warrantee work they checked out the car so they could try to bill me to fix some thing, but came up with my oil was looking a little dark and might want to look into getting it changed soon. I told them I had it under control and thanked them, at that point i had 18,000 miles on the oil [not bad]. I swap filters every 5k and change at 20k, thats just me.
Reviewed by Bertrand:
I now use AMS in a My has powered equipment
Reviewed by Steveo:
I've been buying amsoil for 15 years. I've always been satisfied with all of the products and I've never had an oil related engine problem. Typically my mom goes up as well.
I recommend Amsoil to my friends and they buy.
Honestly there is no longer any reason not to. Synthetic oil is more expensive at your local Auto parts store.
Reviewed by Belus:
I think this is a great product, even I used the product only once. My only problem is the shipping. The shipping is really offset the total cost.
Reviewed by Yo:
Excellent product.............................
Reviewed by jesse:
personal vehicle use, engine purrs like a kitten improved mileage
Reviewed by speedy:
have been using for years now always works better then other oil brands that i have used and its just great only having to do it once a year
Reviewed by Chas:
I've been using Amsoil since 2009 in all of my power equipment from cars, motorcycles, lawn equipment, snow removal, generators and etc. I won't use anything else.
Reviewed by Dan:
Of course anyone who has done any research on motor oils realizes that AMSOIL motor oils are superior to anything else on the market. I like all their products however I am upset at their recent price increases. I'm not sure why they continue to raise prices as the majority of us retired people never get a cost of living increases in our income. Please don't tell me it's R & D or material and labor increases to justify the increase.
Reviewed by John R.:
I have used in my Chevy and Honda notice engine is much smoother and no oil consumption
Reviewed by Jerrod the Main:
So far so good. No problems. AMSOIL has came highly recommended from my research. I plan on keeping my vehicles for the long haul and it made sense to step up to a better oil for my 2015 silverado 1500 z71 and lexus rx350, both of which use the same oil.
Reviewed by
LCaswell:
Amsoil is great use it in everything I own.
Reviewed by Diesel dave:
I have been useing amsoil for over 25 years I have zero problems with it I run it in every thing I have
Reviewed by Tech Chris:
I use. the product in my daily driver has improved gas mileage
Reviewed by Dave:
I have two 2015 Hondas. Accord and Pilot. I put the Amsoil Signature 0W-20 in both vehicles after the breakin oil. (5,000 miles). I now have 40,000 and 65,000 miles on each. I like to get at least 200,000 miles out of my vehicles and they have both done great. Note: I also sent the oil to a lab for analysis with the first three oil changes on both vehicles and had good results.
Reviewed by KevinGeek:
I've been buying 100% synthetic oil since 1974. I've stuck with Amsoil the longest because of their never-ending commitment to research and product improvement. Living in Northern New England where my wife and I both commuted to work, I had no time to entertain cars NOT starting on a -10F work day. I wanted the snowblower to start up - ALSO using Amsoil synthetic - and the cars to start and go without any concern. No need to worry about possible damage on the first cold spin - doesn't occur with Amsoil synthetic and filters. MANY times I have experienced our cars starting and we being on our way while neighbors and friends had to be jumped or call AAA. Combined with P.i. Fuel Treatment to maximize fuel economy I feel like I'm completely covered. Never experienced a motor failure in ANY of my vehicles including two that we drove over 200,000 miles. Keep it up Amsoil! I'm a tough customer, but you've never let me down.
Reviewed by Danan:
I love this oil. My truck runs smooth and does great on long trips!
Reviewed by Matt:
I have a 2016 GMC Sierra cam, DoD delete and procharger. Change it every 5k just to be safe it being boosted and no issues at all. I love this stuff!!
Reviewed by Brad:
Over the past five months I have purchased oil for three cars, transmission fluid for four cars, and engine flush for three, as well as bottle pumps for oil and transmission fluid. In the next month I will be purchasing oil and transmission fluid for two more vehicles. As you can see I'm impressed with Amsoil products so much that I keep buying them for family. It's important to take care of the vehicles that my loved ones drive, because if they break down the result can undesirable.
Reviewed by Bud:
I use this product for maintenance oil changes.
Reviewed by webman:
The thing that attracted me to AMSOil was the long interval usage of their synthetics. Only needing to change the oil once a year won me over and Amsoil is suppose to better protect engines on start-up. That's important in cold weather. It is quite a bit more expensive than conventional oil, but thankfully a person only needs changing this oil yearly which ends up being cheaper in the long run.
Reviewed by king:
i sponser a motorcycle flat track racer and we get the best results with amsoil dominator.
Reviewed by Rich:
Have been using amsoil since I could drive a car and will continue to keep using it
Reviewed by Toyota Rick:
Have used Amsoil exclusively on all our vehicles! Extreme cold winters do not take its toll as with other products. Of course now we use Amsoil in lawnmowers, leaf blower, snow blower and in our 1973 Deutz farm tractor.
We have a lot of $ money in our vehicles and this is our way of protecting our investments !
Reviewed by Sergey:
Great oil. Holds up really well in my turbo Civic - confirmed by UOA.
Reviewed by Cummins4Life:
All Signature Series Oils and Ea0 Filters are the very best ever created.
Reviewed by SydV:
Surely saved the engine of my 2018 Crosstrek during the sub 25 degrees temperature. Starting was smooth. Never felt that the engine was starved of oil. Very reassuring to know the best stuff is in there at every start.
Reviewed by Hoot:
People line up to buy my used vehicles cause they no the love they get, oil being #1!!
Reviewed by FactaNonVerba906:
I thought the synthetic oil used by my Honda dealer was acceptable. Then I performed my own oil change with Amsoil Signature Series 0W-20 + Amsoil EA-series oil filter at 14,000 miles. The difference was immediate. The engine is so quiet now that I have to look at the gauges to see if it is running. No more valve/rocker arm clicking at idle. Acceleration is noticeably improved especially when merging onto freeways, although I haven't timed it. Combined city/highway mileage has increased 2.5 mpg.
Reviewed by Dennis the president:
This is a great motor oil and I plan to get a new version that I saw of it on amsoil.
Reviewed by mr.D:
Since back in 80s amsoil rep sold me on this oil. This is the best motor oil .
Reviewed by Matthew C.:
Only oil I use for any engine I own. An investment worth the payout.
Reviewed by Big papa:
Used in 2017 Honda CR-V
Noticed easy starts in cold temps 10-0 improved fuel economy 1.2mpg
Love it
Reviewed by J:
I put this in to my 2014 Subaru Forester and noticed my engine runs quieter and smoother, the boxer engine was none to pas some oil but not mone
Reviewed by Tim:
I have used Amsoil previously on other vehicles and I currently use this oil on two different Jeeps I own.
Reviewed by Herb:
I use your products for ALL my power equipment & am glad that I use them
Reviewed by KG:
I use this oil in my pickup
Reviewed by GRUG:
I've used Amsoil for over 20 years! This is by far the best oil you can buy! The warranty speaks for itself!!!!
Reviewed by Tom:
I've used AMSOIL for decades. It has saved me lots of $$$ in repairs.
Reviewed by The sparky:
Bought 2016 Silverado changed oil and filter at 3000 miles to AMSOIL changed every time the light comes on to change I know it can go longer and that's great piece of mind I'm a contractor and my load is never light but it never lets me down
Reviewed by Kody:
I have had 2 vehicles that required 0w20 oil. Both vehicles had variable valve timing engines and the oil worked very well for them. It allowed easy cold starts and provided good fuel economy.
Reviewed by HG:
I bought my new 2008 Hyundia March 2008. In June 2008 I changed oil for first time miles 7240. I stared using Amsoil 0W20 and I'still using the sme oil, Amsoil 0W 20. Now the car 320337 miles and NO engine problems. I drive between 12,000 and 15,000 miles and change the filter and add a quart of Amsoil and I'm good for another 15,000 miles. I do routine basic maiintenance,but the engine has never been apart execpt for the timing belt.
Reviewed by Izzy:
this is an outstanding value. great lubrication great price! always recommend amsoil to everyone I meet.
Reviewed by Roncer:
Have been using Amsoil for 20 years. It only gets better.
Reviewed by AJ:
Amazing stuff
Reviewed by Domenic:
This oil is by far the best on the market. I have recommended it to all my family and friends.
Reviewed by Gatorman:
I have been using Amsoil in everything I own.They have all types of oil related products that are great!!
Reviewed by Dave:
I use this oil in my 2017 GMC Sierra. It exceeds the Dexos 1 requirement, that GM has dreamed up. Don't believe their hype this oil will work great in your rig.
Reviewed by Anthony the Lunatic:
I've been using Amsoil in my Supercharged Miata, running track days and daily driving. Using this oil is part of my strategy for dealing with heat and avoiding over-heating in the Phoenix heat. Zero engine problems, and I run this car hard.
Reviewed by Ranchhand:
Have tested it out an out performs wvery thing else as in apples to apples
Reviewed by Ironrail:
I use it and filters in my 2014 Honda Civic and my wife's 2016 Honda Pilot. The difference is absolutely very noticeable. I won't use anything else. I'm a long time user of Amsoil since 1983. I have complete confidence in their products. I recommend AMSOIL products to everyone for any and all uses. All of their products are great.
Reviewed by Mizzouborn:
Been using it for 15 years & no problems
Reviewed by GBDP3:
Been using for years, only oil I put in my car.
Reviewed by GBGP3:
Been using for years, only oil I put in my car.
Reviewed by How:
Saves wear and tear on engine pasts, goes in clear and after 8,000 km. shows very little colour difference.
Reviewed by Jr:
Are use Amsoil in everything I own
Canada
United States
ONLY Amsoil!
I've taken several engines apart but only engines that have run Amsoil and they only need coolant system work. Conventional oil precipitates out garbage and sludges up engines resulting in CLOGGED oil passages. If your switching from conventional, get the best protection you can get that has tons of positive history. Do your homework/research to understand ALL the costs involved. You will determine Amsoil is the best switch you can make for your vehicles.