[1adamb]

Okay, I'm just about to put my newly rebuilt (again) engine in, any thoughts on the break in oil.... dino vs. synthetic?

I want to go with a light weight synthetic oil, the machine shop says to go with dino oil until broken in or the rings won't seat properly...???

I now it's a boat engine, and not a car engine but I know my 01 vette when I bought it new came with synthetic right from the get go.

Any thoughts?

 

[1adamb]

Well, glad you asked. My engine builder who had hands on with the engine says use dino oil.... the machine shop I used to run the engine on dyno and break it in (last time) said I should have used sythetic right from the get go.

That's why the question??????? Two machine shops, two different answers. Kinda like this board, lots of different answers

DINO!

but a silly question, why would you NOT do what your machine shop said on a engine they just did for you.

 

[1adamb]

Re: Re: what oil to use for break in of new engine

30T right away, my machine shop said to use like a 5/30 'cause it's thinner and will get where it's supposed to be faster. That is of course after properly priming the engine etc before hand.

Anyhow, my engine is a roller...

if you have a flat tappet cam use rotella sae 30 T, and one pint of lucas break in additive. thats what we do for all remans we install(flat or roller)

 

[1adamb]

My thoughts on the synthetic is in case the oil gets too hot, like with a blown impellor or something. The synthetic would hold up longer. I installed an oil temp sensor and guage end of last year, so I'll be watching it closely.

I'll see if I can find the valvoline oil or check out the diesel stuff. Thanks.