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.

Ran generator for 20 minutes then drained it all kinds of metal shavings came out. Second time ran for 45 minutes drained it not as many metal shavings came out. And put the Amsoil full synthetic in it. Run smoother check spark plug looks good and not that many metal shavings also added the gas additive run smoother than anybody’s I’ve seen on YouTube. Thanks Amsoil for an excellent product.

Third time I've used Amsoil SAE 30 Break-In Engine Oil within the last 5 years. Excellent results each time and those engines are still running strong. I've been an Amzoil user since 1975.

I used this on my 327. After priming the oiling system. Good oil pressure, no smoke, & no leaks. Going to drain it & go with Z Rod!

Great oil for breaking new engines, remmamuted motors

Good oil for a low price!

Used as directed for breaking in a newly rebuilt engine from the bottom up, rings seated nicely, great compression, will continue to use on the next build.

I always use it to brake in engines

I would not treat my engine to anything less then this Amsoil break-in oil.

We are a military vehicle rebuild / restoration shop. We build a lot of engines, AMSOIL 30W break-in oil goes into every new engine we build.

Engine building

I used the engine break in oil for my freshly build LS motor.....

Glad they have an oil for older flat tappet cam vehicles.

I use it in every new engine.

I just had an engine rebuild on my '62 Ford Galaxie and the mechanic put Delo 10W40 in the motor for break in. It is the nature of a rebuild job for an engine to use oil and I had added 2 qts already then it dawned on me about the break in oil so I ordered some pretty quick. There was a little smoke from synthetic oil which I expected but that happened twice, no more smoke. No more oil consumption and the rings were set pretty quick and when the car comes back from the shop, I have the Amsoil Z-Rod for classic cars waiting on it.