10W-40 Synthetic Premium Protection Motor Oil (AMO)
![]() For use in both gasoline and diesel engines. Offers multi-functionality and wear protection. Ideal for applications where the extra protection of a higher-viscosity oil is desired. Excellent for motor homes and older vehicles, as well as many types of modern equipment and compatible with some motorcycles.
Product Code: AMO •
Brand: AMSOIL
Product Details
Tech Data
Reviews & Rating
Product Applications Product Application Specs • API SL, SJ, SH, SG
Product Description
Superior Wear Protection
Wet Clutch Compatible
Resists Oxidation and High-Temperature Breakdown
Extends Drain Intervals in Gasoline and Diesel Engines
MIXING AMSOIL
SERVICE LIFE HEALTH & SAFETY Click here to view the MSDS Data Sheet for AMSOIL AMO. Keep out of the reach of children. Don't pollute. Return used oil to collection centers.
Great product!350,000 miles on 98 Chevy, started using in the 90,000, don't have to worriy about oil changes , being over due. Item Reviewed: Premium Protection Motor Oils (AMO,ARO)
90-95 LT5 motor oilPreviously 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. Item Reviewed: Premium Protection Motor Oils (AMO,ARO)
Amazing productWonderful 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. Item Reviewed: Premium Protection Motor Oils (AMO,ARO)
Only Reliable Oil Left at Affordable PriceThere 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. Item Reviewed: Premium Protection Motor Oils (AMO,ARO)
Great productUse this oil in an old 1975 Chevy small block racing application. Like the high zinc concentrate Item Reviewed: Premium Protection Motor Oils (AMO,ARO)
Been using for years.The filler spout is too big to fit all of my bikes cars & trucks. Like the oil. Item Reviewed: Premium Protection Motor Oils (AMO,ARO)
YesRace application Item Reviewed: Premium Protection Motor Oils (AMO,ARO)
works greatUse this in my John Deere Diesel engines as well as my Chevy Trucks Item Reviewed: Premium Protection Motor Oils (AMO,ARO)
Excellent productskeeps my 33 running strong Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
Long time user.Have used Amsoil products (used to sell it) since 1974 in all of our better vehicles and farm equipment. Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
Best there isI 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 . Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
Fantastic oil.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. Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
this oil works greatI use this oil in my high mile Plymouth with 175k miles on the engine without any trouble with lots of highway miles. thanks Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
I have ben buying it for the past 40 yearsI 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. Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
Good productPut 7qt. in my 68 Charger and I am very happy with results. Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
Never running Mobile againNot 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. Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
Have been using it for yearsI have used it in my durango for years.It is a great synthetic oil Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
I won't use any other oilI love the piece of mind knowing when I crank up my truck in the morning there's no dry starts Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
ExcellentI 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. Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
I love the high zinc oil!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! Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
I love the high zinc oil!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! Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
2013 Toyota RAV4My 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.. Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
Hard to beatI've been using this for as long as I can remember in my Land Rover Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
JgtxmaintGreat product and fast shipping at reasonable price Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
JgtxmaintGreat product and fast shipping at reasonable price Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
Good stuff !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. Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
Will purchase againI have used this product for 16 years with extreme satisfaction and have always recommend the Amsoil products that I use Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
For my 90 YJI'm 60 years old and have used every possible lubrication known to man, Amsoil is by far the best. Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
Superior protectionI 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. Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
Great product hands downI 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. Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
Reviewed by Amsoil: I think the 91 Yotas gonna love it!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 Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
Reviewed by Chip: A hidden gem from an outstanding dealerI've tried all the good stuff - from "German Castrol" to Redline to Royal Purple to Rotella etc. Item Reviewed: 10W-40 Synthetic Premium Protection Motor Oil (AMO)
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Great oil for modified turbo motors
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.