Used this oil for breaking in my 5.3 build. I wouldn’t use anything else. Especially for such a critical procedure.

Has added zinc which is great. Good for fully breaking in small engines also. I like that it's red in color so you can check it to make it's not getting too dark.

I ran my engine with the amsoil break in oil and my motor is breaking in very well... I had to remove my motor to swap parts to put in a different vehicle and everything is breaking in perfectly.

I have reviewed the specifications of several oils for my new Pontiac 455 GTO drag engine (1967 GTO) I have decided on Amsoil for break-in. The engine is a non-roller 12.5 compression unit with a high lift cam so proper break-in is critical.

I used amsoil sae30 break in oil while restoring my vintage motorcycle I bought back in college. It’s working great!

Great product for breaking in you new build I recommend to anyone with a rebuild

Good value, quick ship

I understand that the break in period of a new engine is critical for the life of the engine so that is why I trusted this oil for my new sawmill engine.

I have used this in many engine. I used it to break in a 26hp kholer engine and ever since the oil stays very clean after many hard hours of work signifying that the rings are well sealed. Also I build race engines and use this to break them in. We had one motor that had to be torn down 4 times and I reused the rod and crank bearings all 4 times because they were perfect. So I got to see the bearings after about 6 different nights of racing in them and the oil pressure is excellent still. We get great ring sealing with this oil and I will always sell my motors with this oil.

Great product.

I am currently having AMS provide me with a high performance built race engine for my 2010 GTR. AMS builds and tunes the fastest and most powerful GTRs in the world. I haven't actually used your product yet, but purchased it and will use it based on the recommendation from AMS to break-in my built engine using your engine break-in oil. Because AMS recommended your product, in my view your product must be the best product on the market for the break-in of high performance built race engines. Having read and reviewed your technical data for your products, it is obvious that your products are the most superior on the market.

best break in oil on the planet

Use it in 206 Briggs and world formula engines. All my engines out perform most competitors engines.

Rebuilt my engine, used this for the first time. No issues, changed after 1k mile break-in process.

Does the job I have no complaints with anything amsoil

This stuff is great, I ran this in my new Harley big bore 95” for 800 miles and everything is working smooth as butter ! Amsoil is the best

Came in the mail quick, put through the fresh LS5.3 ripper and it’s still got oil pressure so it must be good.

Great product. First used to break in solid lifter cam, the moves can over to rebuilt motor and used to break I. Piston rings. Great product. I’ll be using it again on my 289 when it’s complete.

Synthetic oils are superior, AMSOIL is a superior product!

No need for special additives, just buy the correct oil for the break in and the confidence is there.