Product Reviewed: Signature Series Motor Oils
Current Rating: 4.95 out of 5 stars
Votes & Reviews: 529 vote(s) and 1218 user reviews.
Reviewed by My bader: 
I put this in my wife's
Audi and my Range Rover sport better engine protection and best oil you can buy.
Reviewed by N/A:
Great oil, everything advertised is accurate!
Reviewed by shorty:
my truck has 256000 mile run like new
Reviewed by NVTGhost:
Keep my car in Tip top shape.
Reviewed by Torque Man:
I use the oil and filters in my muscle cars and truck. The click everyone complains about went away in the motors .Easy startup on the motors and no dry lifter sounds.
Reviewed by stanger:
Greatest point is that I only need to replace the oil once per year as I only put on approximately 25-30,000 kms per year.
Reviewed by Cgc:
Seems good....engine hasn't blown yet.
Reviewed by HICSMMA:
I use all Ams in all my toys and cars! You get what you pay for. This is the best.
Reviewed by Jeff:
When trying to go the full 8000km between oild changes typical synthetics do seem the break down around 6000km, You can tell but the return of valvetrain chatter even faintly after startup. I've noticed the Signature series holds up and I no longer hear that return as the miles / km's increase. Great Product!
Reviewed by Guilty-Crown-:
The title says it all been buying for a long time for multiple different vehicles never fails
Reviewed by Mark:
Have used this oil for 20 years along with EA filters on my vehicles.
Reviewed by Gallaticus:
I use Amsoil Signature Series Synthetic oil in my 2011 Toyota FJ Cruiser along with many other Amsoil Products and I will never look back. I change my oil and filter every 10,000 miles. I go 25,000 between oil changes on my daily driven 2006 Pontiac Grand Prix. My FJ Cruiser sees a lot of towing and off road use so I change it more often than recommended; although I'm more than certain it could handle the 25,000, no problem.
Reviewed by HollisJR:
My Honda CRV runs great on this oil. My mileage has increase and it just runs smoother. I highly recommend this oil. The best in the business.
Reviewed by none:
Best in the business
Reviewed by Zac:
Look at any proper sheer test and this wins. The only oil I'll trust in my boosted built engines!
Reviewed by Bryan:
Wonderful product I could tell as soon as I started my vehicle it sounded much quieter and I'm getting a little over a mile and a half better gas mileage.
Reviewed by RJ:
Had a slight tapping noise coming from my engine, after a oil change and new filter will AMSoil the sound was almost unheard, after a few hundred miles the engine is purring like a kitten : )
Reviewed by Eddie:
Why because it is the best. Period! Amsoil is the best product company in the nation. Their staff are courteous knowledgeable and will research the items best for your vehicle upon your request so you would get the specific items.
Reviewed by Woodmansk:
Is there a better oil?? I think not
Reviewed by Big Red:
I love this product only the best !
Reviewed by meg:
better than the oem recommended
Reviewed by Bill The Finn:
11 out of 10
Reviewed by O-tie:
I have used 5w20 for many years in our f150 ford trucks and will continue for many years to come
Reviewed by Capgoat6:
This oil has always delivered the best protection for any engine. It keeps camshafts and other engine parts from ever having a metal to metal issue.
Reviewed by
Bob:
Been using Amsoil since 1996
Reviewed by Honda:
I would not hesitate to buy several cases of this my car runs great since I started using this don't hesitate to buy
Reviewed by Mike:
You can feel the difference compared with other synthetic oil
engine runs very smoothly
No need to add any oil for thousands of km
Reviewed by Vette71:
Best oils ever. Used for years.
Reviewed by Jimi:
This is the best synthetic motor oil I've ever used. My 2007 Toyota Camry V6 sounded and felt smoother than before. That's what 100% synthetic Amsoil does for your vehicle. I will be putting Amsoil on my 2010 Lexus ES 350 as well. Amsoil on my vehicles only.
Reviewed by Lance:
Its such a good product, it has done me good all these years i will be buying more in the years to come.
Reviewed by Steve:
I use this in my racecar and it's the only oil I'll use.
Reviewed by Bill:
I only use Amsoil full synthetic oil in my vehicles. This includes my motorcycle.
Reviewed by Dman:
Holds up very well for changing it out every 10,000 miles. No burn off like other oils.
Reviewed by Harrison:
Sorry haven't got enough run time yet but I changed everything from mobill1 and Harley to your synthetics
Reviewed by Brad:
Best oil on the market hands down... tests prove it and the protection speaks for itself! I wish I had switched a long time ago because it would it saved even more life on my engine. 1999 Honda Accord with 250k miles on it and it runs like new! Thanks amsoil! Well worth the extra money because you save it from having to change it once a year!
Reviewed by None:
I use to do a lot of driving . All my vehicles had 400,000 + miles on them including one Suburu with 505,000 only reason still not driving was not the engine but the rust eating the frame and body due to heavy salt used in winters .. .used the 25,000 oil change 10 -30 signature and 15,000 mi oil change filter . Changed oil and filter every 15,000 mi . Only added Extra half qt to qt at around 13,000 mi. Been a user since 1980's wouldn't use any other oil .
Reviewed by Joker:
Best ever, been using for years and have plenty of people switching as well. Great product.
Reviewed by Mopar16:
This oil is amazing I use it on my hemi 6.4 and everyone know about the hemi tick but with this oil I don't hear it at all so I love the oil I am sure the tick is still there but the noise is very low.
Reviewed by Flyer:
I developed an oil leak which when discovered had depleted four of six quarts of amsoil which I believe prevented some serious engine damage. I have used this product in my F-150 Edoboost since 5000 miles and The truck now has 174,000 miles. Can't say enough about this great product!
Reviewed by DS:
I'm very impressed with this oil. I thought the gas mileage might go up a little but it went up by over 3 miles per gallon. I've checked it for 4 fillups since the oil change and it actually got a little better. I will be checking it for color change and oil life. It's great so far.
Reviewed by Jc:
Use in car and truck. Works great.
Reviewed by Mr. Preventative:
My truck runs so much better, and oil changes done once a year now.
Reviewed by LOU:
Keeps everything running cool and smoothly. My go to..never use anything else.
Reviewed by John:
My vehicle engines have lasted a long time and I get better gas mileage to boost.
Reviewed by Joe P.:
I am a part time rideshare driver and have averaged over 22,000 miles a year. I go 10,000 miles between oil changes and have almost no burn off or evaporation. Have used Amsoil for 30+ years to protect my vehicles. Great stuff!
Reviewed by GW:
I've been using the product for many years and trust Amsoil for all of my equipment - car, truck and all power equipment.
Reviewed by Popgun:
... in every vehicle I have owned, new or used, and will continue using Amsoil as long as I have a car! Never had a problem even though I changed the oil annually. One service tech even asked why I was changing the oil since it was so clean! That's Amsoil, that's quality!
Reviewed by KC:
As always, Amsoil produces great products for our "fleet' of vehicles ranging from SUVs, motorcycles, and trucks. Customer service is unparalleled.
Reviewed by Dave:
AMSOIL 0w-20 Signature fully Synthetic Motor Oil. Been using this oil in my vehicle since I purchased it.
Reviewed by Bob:
I have used Amsoil in all my equipment for many years. I still enjoy changing my own oil and maintaining all routine maintenance myself. I appreciate being able to to go an entire year without another oil change and doing the work myself. I use this oil in my street rod, full size suv, 4 stroke outboard boat and gearbox, plus all of my outdoor lawn equipment. I also use Amsoil 2 stroke oil in all of my lawn equipment including a 1976 Homelite chain saw that has never been overhauled that still runs very strong.
Reviewed by Mr. Z:
I received fast shipping on a great product! Thanks Amsoil!
Reviewed by Golden Eagle:
I have used Amsoil Signature oil in my business car. Today with over 400,000 miles on it.... Still running like new! No other oil even comes close to the protection and value of Amsoil Signature!
Reviewed by Jeff:
My vehicles run smoother, with less vibration, and are quieter. The also run about 10 degrees cooler than they do with other oils. And, my gas mileage went up about 3 miles per gallon.
Reviewed by Seabee624:
I change my oil once a year roughly 12,500 miles
Reviewed by Squire:
I Like the throttle response with Signature Series Amsoil !
Reviewed by crazy joe:
We use this product in all my Jeep Cherokee Sports 1999, 2001, 2003 Grande Cherokee, and a 2004 Durango SLT 5.7 Hemi. They all run great and have a lot of miles on them. We also have a couple of old race cars and use it in them, if we get them out. We are hard on our cars and use them we are not granny drivers by any means the 2001 Cherokee only has 157,000 on it but we are going to start to use it daily as of tomorrow. the others are all used every day.
Reviewed by Krzysztof:
This oil last long time and the inside of the engine looks clean and really smooth. Great product and works magic. Thanks
Reviewed by Whitey:
I believe this to be the best motor oil.
Reviewed by Amsoil since 1983:
Order was easy. Shipment was right. Product is great. Customer service was awsome.
Reviewed by Scott:
Shipping was prompt and everything came in as promised
Reviewed by Birdman:
Great quality oil and filter - less oil changes and the perfect protection for the engines on my vehicles.
Reviewed by Harley:
I aways use amsoil products after I used this oil in a car of mine that had a ticking valve when it was cold for carbon buildup The Tick went away never came back.
Reviewed by Rosa:
It has been working excellent and we will always recommend this products to our friends and family.
Reviewed by Dave'sAuto:
5.3 engine in my wifes `16 Suburban is smoother and quieter with the Amsoil 0w-20 SS. I was running good oil before, however this one seems even better.
Reviewed by Rich926:
The absolute best oil I have ever used.
Reviewed by Grandpappy2002:
Best oil I've ever used
Reviewed by Ron:
In my truck
Reviewed by Welderguy:
My Engine has never ran so smooth! Engine temperature runs slightly cooler as well. I couldn't believe it till I seen it! Want a vehicle to last longer just treat the engine with this oil.
Reviewed by Greg:
I use amsoil for all my oil changes to have the best for my hemi/Ram
Reviewed by Pappy's Performance:
I researched all the oils and for several years Amsoil is the only oil I use in my personal vechicals and my customer's motorcycles.
Reviewed by JB:
Best in class product!
Reviewed by G-Money:
Have used in 2004 Toyota Sequioa, 2004 Toyota Tundra and 2010 Lexus RX350. This oil does not sound nor feel like any other synthetic I have used in the past, engines just seem to feel more lubricated and ready to perform, even at 10,000 mile changeout intervals, though I know the oil is formulated to go much further than that. Best oil I have been able to find for sheer ratings/high PSI strength...best oil I have ever run period.
Reviewed by SQUIRE:
I LIKE THE WAY AMSOIL PRESERVES MY EQUIPMENT. IT ALSO MAKES THINGS RUN SMOOTH AND POWERFUL THE ROLLERS ON MY OVERHEAD GARAGE DOOR RUN SMOOTH AND EASY WITH THE AMSOIL !0-30 SIGNATURE SERIES OIL!
Reviewed by C 150:
Ask any knowlegable mechanic, they all praise this product.
Reviewed by Mark:
This I used it my John Deere. I put it in the automatic transaxle. Much quieter now, and faster.
Reviewed by John:
Reviewing motor oil is a slippery topic. There is no way to determine if there is less wear and tear on the engine, but it looks delicious coming out of the container!
Reviewed by Ricky:
I use it in everything I own
Reviewed by Rane:
I can't say anything bad about this oil. Our 2016 Mazda 6 has had zero issues from the drivetrain. Zero issues with anything actually. I changed the engine oil and trans oil(manual) out as soon as I got the car home with less than 50 miles on it. The only thing I do that's not amsoil is add Liqimoly because the factory oil for our engine requires a high moly content. I change the oil every 15-20k and top off every 3-5k. The engine looks very clean inside the crankcase and under the valve cover. It still runs as smooth as the day we bought it and no leaks at 130K. I also use this oil in my brand new Tacoma TRD off road 4x4. I refused their complimentary free oil changes and stuck with what I know is a higher quality product.
Reviewed by DudleyDoRight:
I purchased Amsoil for my 3.6 LFX V6 Camaro. I went about 6k miles and changed the oil in the engine. I sent out a sample to an oil analasys lab and the results came back great. They recommended going 8k miles before changing the oil again because there was still plenty of "life" left. I will continue buying Amsoil.
Reviewed by Hollywood:
My turbo forester runs good with this oil
Reviewed by D.J.:
Great Product , Fast service, good price
Reviewed by Moose Man:
I use this in all my vehicles. Bought a 2006 Honda Civic new for my son. He still uses it and it has 350,000 Kms and the engine still runs great. Always use AmsOil filters
Reviewed by Dan the man:
I've bought this oil after watching YouTube videos of it beating out the other oils people buy. I usually do royal purple but not anymore. This oil cause less wear and tear and my car runs more smoothly. The best part is it's 100% synthetic. Royal Purple isn't. Great product. Definitely going to buy again.
Reviewed by wayno bam bam:
Just sold my 07 Prius with 200K. Used 1 quart in 19K as topping oil. Never had the head or covers off, changed plugs twice.
Reviewed by JAS:
I have been using Amsoil for 25 years and never had engine issues. Great products!
Reviewed by RonV:
I have been using Amsoil for over 30 years and think it is the greatest. I use it in all my cars, mower, and mix the marine oil with gas to run in my chain saw, weed,eater, and hedge trimmer. I recommend Amsoil to everyone who will listen.
Reviewed by Aaron:
Doesn't burn off like other oils this stuff is amazing
Reviewed by rolo the mech:
use in all personal vehicles and equipment
Reviewed by Uncle T:
I first started using Amsoil 10w40 in 2015 in VTX 1800. Then in 2017 started using oil in 2014 Patriot. Cooler, quieter and better mileage. Longer intervals between changes. Will not use any other oil in any machine I own as long as Amsoil makes it.
Reviewed by Rick:
I keep buying this product because I now have 379,000 miles on my factory 1.4 turbo GM motor
Reviewed by Jake's toys:
I use Amsoil in all my motors
Reviewed by Nick P:
I mean its a really gold Oil and as a memeber you get It for the same price as anything else on the market. How do you go wrong. I got 300k on my car and still going strong because of this stuff.
Reviewed by kevin:
i use only Amsoil signature series for the past 20 years. the best lubrication, protection and no gumming.
Reviewed by carlistilllo:
i use only the best oils, and this one is one step ahead of everything ,car runs smooth, cooler and much efficient ,thanks!
Reviewed by Daddy Plummer:
I use this oil because of extended oil changes .... I change mine
every 10000 miles but rated at 15000 miles. Currently have over 240000
miles on engine and have used it since new so very happy with engine life
Reviewed by California Nordahl:
I have been using AMSOIL in my vehicles for 37 years, for better fuel economy, better engine, transmission, and rear end performance, and much better protection for all vehicle components. I love this new oil upgrade for its protection, particularly against preignition. Pulling a trailer in hot summer weather with a turbo engine makes this kind of protection mandatory.
Reviewed by ocdpops:
Have two 5.7 hemis. One is higher compression with forged pistons( ie: burns a little oil). Oil consumption with Amsoil is 50% of other oils. valve train is noisy on 5.7 hemis. Using Amsoil reduces noise 75- 80%. MPG on both vehicles has increased.
Best oil I have ever used.
Reviewed by Steve:
I've got a Shelby GT350. Voodoo engine is very special, and also very expensive to replace. While I can't 100 percent say amsoil has kept me out of trouble. I've beaten the tar out of the car at the track and barely consumed oil unlike many others. Will continue to use the product on this car!
Reviewed by USAFVet:
I have used Amsoil products, exclusively, pretty much since I first heard about them back in 1977! Motor oil & filters, trans fluid, differential fluid, grease, MP, YOU NAME IT! I have NEVER had a lubricant-related failure, or wear-out, since! These are simply THE BEST LUBRICANTS MONEY CAN BYE...PERIOD!!!
Canada
United States
I ended up getting the transmission fluid.
I initially ordered the transmission fluid and accidentally got the engine oil. After returning the engine oil and receiving transmission fluid signature series, I must say how pleased I am. I noticed the few MPG improvement after changing the transmission fluid which had 43K on it. The engine shifts through the gears more smoothly.