What oil to use for break in ?

Hey Guy's I was wondering, What oil should I use while breaking in the new motor, I live in Texas and it's hotter than a two dollar ***** in a pepper patch, should I go thick or thin? Don't want to have any problems later on,
Thanks in advance

 

Don't use synthetic or thick oil for break-in. Synthetic isn't good for seating of piston rings. Thick oil probably isn't good because of the relatively tight tolerances between moving parts just after machining/rebuild.

Deluxe

 

See if your local machine shop has Brad Penn 30W Break-in oil...

 

If you are using a flat tappet cam, make sure you use an oil with zinc in it or put in an additive with it in.

 

Thanks for the replies, I'll do some checking around for that 30 w,
Seems like I've heard of that a while back,,
Thanks again

 

Thick oil? Depends on the the rebuild. When you set the tolerances they can dictate what weight oil should be used. I would say a little more education about bearing tolerances and rebuilds would help out. You're not gonna use a different weight oil than the engine is set up for. Also to light of an oil can be bad for the engine as well.

There are a few good additives on the market specifically for this again. A few of them had been pulled off the shelfs, but they're back. Crane has a decent one as well as whatever GM is calling the EOS stuff these days.

 

My flat tappet engines get Rotella and a bottle of Comp Cam break in.

-Lee
Atomic Radio
www.atomicpinup.com

 

This is exactly what i use too. And i continue to use both with every oil change as well. I'll use the Comp brand additive or GM EOS if i can get it.
The Rotella has changed some from what i've read and dosn't have the same amount of the 'good stuff' if used to, that's why i use the break in lube too..
Prior to this, i wiped a cam out in my 57 chevy...since doing it this way i have had no problems at all..

 

Tony...you're right about Rotella. I just found out last week on this forum they took the zinc out. Like you, I throw in a bottle of Comp with every oil change.

-Lee
Atomic Radio
www.atomicpinup.com

 

Valvoline 20/50W Racing oil has more of the good stuff still in it, and is usually available at the chain parts places. Some of the good stuff missing from oil is to save some sensors in the exhaust systems of newer cars, or some ******** like that. But, racing oil, theoretically being for off the highway use, is aimed at cars without those sensors. So, it can maintain higher levels of zinc and whatever else