Product Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
Current Rating: 4.77 out of 5 stars
Votes & Reviews: 48 vote(s) and 54 user reviews.
Reviewed by Piotr: 
Running Toyota I6 motors with turbochargers on AMO 10W40. Motors are very clean inside, running smooth and quiet. It's quite expensive in Europe, but who bought something best in its category and cheap?
Reviewed by Bradley:
Porsche 911 air cooled
Reviewed by James:
Purchased for use in an inboard v 6 boat engine. Great oil for this application.
Reviewed by Cecil:
Great product
Reviewed by Richard:
Love this oil, the full synthetic oil I was using can not even hold a candle to AMSOIL. The engine runs so smooth and much more quietly : )
I also went from a 5w30 to the 10w40 for the summer, will change back to the 5w30 for the winter.
When I'm ready for a transmission fluid change I'm changing over to AMSOIL too.
Richard
Reviewed by Joey:
Bought this oil for our 2015 Scag Cheetah, so far it's amazing, it seems to run way better, and for some reason it doesn't pop anymore when starting it. It has a 31 hr Kawasaki motor . Our dealer told us to use 20 w50 in it, now I gotta cross reference the oil filter and order some.
Reviewed by Adam:
Product does wonders in the evo. The turbo requires high zinc so this does the job.
Reviewed by Shawn:
This Amsoil Motor Oil is used in a track car that constantly see's high RPM pulls on a road race course. Works well and oil temps seem to stay steady throughout a 20-30 minute session. Am pleased with the product and will continue to use it. It's what I would call "cheap insurance".
Reviewed by Thor:
The Amsoil high zinc formula is all i use in my bbc. This oil holds up to the heat and high compression of my street/strip motor.
Reviewed by George:
I will continue to purchase nothing but AMSOIL for all our lubrication needs. Classic cars, snowmobiles, 4 wheelers, and our daily drivers. Gas and diesel. And dont forget the boats. It's one place for everything, shipped to my door.
Reviewed by Hilton:
Dad wanted an upgraded oil in his new F250 and I knew this company produces the best oil and I also run this in my Dixie chopper.
Reviewed by Thomas:
Great oil for my diesel pickup.
Reviewed by Randall:
Great oil for street and track. Got my 996 oil analysis back after 6 months, multiple track days and of course...perfect results! Keep up the great work!
Reviewed by
D:
The absolute best of the best. I use it in everything. Every engine I use this oil in has never given me any kind of oil related problems. If you want your engines to last this is the oil to use.
Reviewed by Otis:
This oil is used in an extreme situation. Been a customer for years. No issues or failures
Reviewed by Raycer:
I changed from the boosted version which lowered my my oil pressure way to much. Now my oil pressure never drops below 40 psi. With the boosted version it dropped to the 25 psi.
Reviewed by Johnny Racer:
I've been using this oil for 10 years in my 1995 BMW 325 which is a track/race car only. I put about 2000 miles a year on it and change the oil once a year. The engine is very happy runs like a top and I have 125,000 miles on it.
Reviewed by Keith:
I'm 65 years old and have been into automotive lubricants since I was a teenager. Out of all of the Automotive lubricants I have purchased and tested over the years. Nothing surpasses Amsoil products. Unlike most, I still change my engine oils at 3000 miles. That being said, I own a 1988 BMW M5 with almost 200K miles which still runs like it just rolled off the show room floor. There are many other brands and types of oils I consider to be excellent but nothing come close to Amsoil. It's the most trust high grade lubercants I have found to date and will NOT use any other brand.
Reviewed by Robert:
I use this in my old hot rods and love it again was useing other synthetic oils but none of them are close to amszoil.
Reviewed by Kubs:
I put this in my 2002 base model Corvette, and:
-became the overall Top Eliminator at the NCCC convention 2017. (although I'm not a drag racer)
-Finished 2nd in Autocross.
-Set at track record at Putnam Park race way.
-Ran all day - two days in a row- at a track event at NCM.
with all the things to worry about when racing a street car, I can check Oil and Engine concerns off the list.
Reviewed by Roy:
My modified Subaru makes over 100 hp per cylinder so I need a very stout oil. This stuff pours like water, but has a very high viscosity at high temps. It also has loads of zinc and phosphorus which makes it perfect for high horsepower applications, turbo engines, and american hot rods.
Reviewed by Joe:
350,000 miles on 98 Chevy, started using in the 90,000, don't have to worriy about oil changes , being over due.
Reviewed by LouFa:
Previously used Mobile 1 for years, but the specifications changed over time and didn't meet the GM specs for the engine. I transitioned to Amsoil and the engine ran even quieter and I know it's getting the proper lubrications that GM intended for the DOHC LT5.
Reviewed by Voganni:
Wonderful oil for older engines that can use it. I routinely run it for years at a time in my tractor and pickup. Neither uses any oil.
Reviewed by Scott:
There are no other decent high-quality 20W50 oil products around for this price. Cannot think of a better value, at least on West Coast. Engine runs just as dependably, even out of a tire slide, as when brand new.
Reviewed by Josh:
Use this oil in an old 1975 Chevy small block racing application. Like the high zinc concentrate
Reviewed by Ed:
The filler spout is too big to fit all of my bikes cars & trucks. Like the oil.
Reviewed by Allen:
Race application
Reviewed by Scott:
Use this in my John Deere Diesel engines as well as my Chevy Trucks
Reviewed by Jeff Pease:
keeps my 33 running strong
Reviewed by JimB:
Have used Amsoil products (used to sell it) since 1974 in all of our better vehicles and farm equipment.
With annual or semi-annual changes of engine oil, never an issue related to lubrication and sludge or varnish buildup is a thing of the past.
Reviewed by Casper:
I have been using Amsoil in my cars that I drag race for 12 years...never an issue....Amsoil is by far the Gold standard of motor oils .
Reviewed by griz86:
This oil has a very strong cleaning aspect. When I drained the oil the first time I used it in a motorcycle with 17000 miles on it, it came out looking like thick almost gloppy molasses. Very black and quite thick. Subsequent oil changes have resulted in the oil coming out much cleaner. So much so that I can see light through the stream of oil as it is draining from the engine. I recently removed a side cover to inspect the clutch plates. The inside of the engine is clean like it was new. I'm very happy with this product.
Reviewed by jim:
I use this oil in my high mile Plymouth with 175k miles on the engine without any trouble with lots of highway miles. thanks
Reviewed by Robert:
I run AMSOIL 10W/40 in both vehicles a 2006 Tundra Limited, a 2012 Dodge Caravan and my John Deer 300X Riding mower and in every vehicle I have owned over the past 40 years. When 50w AVOIL was available I ran it in my 1977 Cessna 172N.
Reviewed by Buck:
Put 7qt. in my 68 Charger and I am very happy with results.
Reviewed by Mopar
maniac:
Not the cheapest, just the best. After tearing down my motor after 250hr for rebuild/refresh, my rod, cam, and crank bearings still looked new. Keep in mind this isn't a pampered motor. It gets run hard, yet the rebuild seemed completely unnecessary.
Reviewed by Thomas:
I have used it in my durango for years.It is a great synthetic oil
Reviewed by Bob Barker:
I love the piece of mind knowing when I crank up my truck in the morning there's no dry starts
Reviewed by ZH:
I am a firm believer in Amsoil. This oil helped me out with my 75 chevy 350. It took away an engine tick. It also runs and idles a lot smoother. Excellent product.
Reviewed by Dirty mike_oni_gaijin:
I've been using this oil in my drift cars for years now, and have gotten to tear a couple motors down for rebuilds ( due to low compression) and got the opportunity to see that the oil has Done it's job! It kept the engin clean inside, and protected the bearing like it was supose to!
Reviewed by Dirty mike_oni_gaijin:
I've been using this oil in my drift cars for years now, and have gotten to tear a couple motors down for rebuilds ( due to low compression) and got the opportunity to see that the oil has Done it's job! It kept the engin clean inside, and protected the bearing like it was supose to!
Reviewed by Bobby:
My application is a 2013 Toyota RAV4 with 15k miles. I use 10w-40 Amsoil and change just once a year since I normally drive about 3800 miles a year anyway using Amsoil Full Synthetic..
I feel more confident using this and changing it myself the first several years as opposed to letting Toyota change it for FREE with regular oil every 6 months. Basically I can do it myself once a year and still save time from waiting around at a stealership lobby and have confidence I will not sludge up ever with better protection. Not to mention I know I do it right and tighten everything back up.
I personally had some bad experiances in the past and do not trust them working on my car since I bought it new. One time the spark plugs were apparently never tightened as an example on another
new car we purchased during a service.
Reviewed by P:
I've been using this for as long as I can remember in my Land Rover
Reviewed by JGTX:
Great product and fast shipping at reasonable price
Reviewed by JimsToys:
Great product and fast shipping at reasonable price
Reviewed by Fred:
All I have ever used in my motorcycles. Runs noticeably cooler and longer between changes. Couldn't use in the old 1942 Harley though. Leaked out too fast.
Reviewed by LEE:
I have used this product for 16 years with extreme satisfaction and have always recommend the Amsoil products that I use
Reviewed by Slick mike:
I'm 60 years old and have used every possible lubrication known to man, Amsoil is by far the best.
Reviewed by David:
I use the Amsoil high zinc formula in a high reving 4cyl application . The oil pressure and temp are never an issue while on the track and I like the extra protection that the zinc provides for the camshaft and shim buckets.
Reviewed by Dan:
I use this product in my work van with an oil bypass filter along with my stock oil filter, my van has over 340,000 miles and has had the oil bypass filter since it was new and I truly believe that Amsoil has kept me on the road this long.
Reviewed by Amsoil:
I feel like a kid in a candy store, when I go to get fresh oil etc... . Thank Goodness, it's Clear as a spring day in the southwest. Amsoils #1
The Yotas Gonna Love
it!. I was Surprised to see it, down the way, at a cig store of all places! Fine with me. I treat the motorr in the truck,lol better than myself!
I thought the price was Xlnt too. Yum
Reviewed by Chip:
I've tried all the good stuff - from "German Castrol" to Redline to Royal Purple to Rotella etc.
From 0w to 50w in all kinds of weather.
From the '62 max wedge Savoy to the '88 w150 roller 318 - this oil works best for my Mopars whether it's the Canadian winter or the West Texas summer.
Good pressure at hot idle, excellent flow and fast cranking in -40 (good battery helps).
My tweaked '81 high compression W150 is my daily driver and gets 13/18 mpg with non ethanol Shell 91 and Amsoil AMO.
I don't bother with UOA of Amsoil anymore, this oil is always on top.
I change the oil and filter once a year and it doesn't need topping up between changes unless I'm towing 3000 miles to TX in the summer - about a pint.
Anne & Alex Farkas give me personalized service - thanks folks!
Canada
United States
Reviewed by Nasos:
16 years and going
Kawasaki versys 650 2007 model, 160000 km, been using this exact oil from the begining (2009), runs smoothly and strong 16 years later, never changed clutch plates no need yet...totaly recommended