Engine Break In Oil

[jewelproject]

ive been told i need to use "break in" oil for my rebuilt engine.

whats break in oil? is that straight 30w?

in the past ive helped with engine rebuilds, chevy motors mainly.

by what i remember we never used "break in" oil. we used nonsynthetic

oil. then changed the oil after 300 miles to synthetic or fresh oil.

[toycar]

ive been told i need to use "break in" oil for my rebuilt engine.

whats break in oil? is that straight 30w?

in the past ive helped with engine rebuilds, chevy motors mainly.

by what i remember we never used "break in" oil. we used nonsynthetic

oil. then changed the oil after 300 miles to synthetic or fresh oil.

Ive always used synthetic, weight being specific to the motors OEM need. Usually 5w30 on an I4 motor.

Reason being, synthetic oil leaves a film, sort of, on the metal. In my opinion it helps protect your rotational assembly while its briefly running dryer than normal. I also marinate my bearrings in synthetic for atleast 24 hours, usually a week or so. That gives them a natural film of protection thanx to the oil.



Im sure others will tell you to buy the cheapest shit you can, and what I just mentioned isnt needed. I dunno, maybe I over do it. Ive never built a motor that wasn't perfect the first time though if that matters at all.

I think its more opinion then anything. My opinion is stated above, however I honestly dont know factually that it makes one single shit bit of difference. Theres more then one way to do it thats for sure, and Im sure there are plenty of success stories either way cheap vs premium.

[oyajicool]

It is not recommended to use synthetic oil since it is too slippery which prevents from break-in properly.

Ams-oil sells break-in oil.

I've used regular oil for my build in the past with no issue.

http://www.aera.org/downloads/BIP.pdf

Found the link above,,,

[toycar]

It is not recommended to use synthetic oil since it is too slippery which prevents from break-in properly.

Ams-oil sells break-in oil.

I've used regular oil for my build in the past with no issue.

http://www.aera.org/downloads/BIP.pdf

Found the link above,,,

never heard anything like that, ive always hear good things and had good luck using synthetic.


Anything you can reference that I could read up on?


I'd hate to think ive been doing it wrong all these years...

[oyajicool]

Click on the link if you want something to read about the subject. If the synthetic oil you were using had been formulated to use as a break-in oil, it would be OK to use for break-in.

This pdf link is what I've found today which is agreeing with what I've been hearing for a long, long time.

Pleas pay attention to the word "recommended" used in my post as well as on the PDF file link I found today. It suggests that there is no WRONG or RIGHT here.

[owequitit]

ive been told i need to use "break in" oil for my rebuilt engine.

whats break in oil? is that straight 30w?

in the past ive helped with engine rebuilds, chevy motors mainly.

by what i remember we never used "break in" oil. we used nonsynthetic

oil. then changed the oil after 300 miles to synthetic or fresh oil.

Break in oils typically have higher concentrations of zinc, copper, molybdenum disulfide etc.

These all help to ensure that the metals wear in properly during break in.