Originally Posted by SH-60B

Gotta disagree with you there. The roller cam won't need break-in. The crank bearings should be riding on a wedge of motor oil, if they are contacting at all, someone ignored clearances. I've never seen a procedure for breaking in a distributor gear or a timing set either.

Originally Posted by MotorHead

After biulding a few roller engines I was trying to get the point across that there are other parts of the engine that have metal to metal contact (rings) and you still need to use a breakin oil for the first 500miles, after that you can use whatever you want as long as the oil has a good zddp levels.

If you are right about the crank and crank bearings then they should last forever, unfortunaltly in the real world they do wear out and the crank needs to be machined and new bearing to match are needed

Originally Posted by caryb78

I am confused. I am having a roller cam installed in my 78 L-82 Do I need a break in oil or can I stay with my Quaker State

Originally Posted by 540 RAT

Manufacturers do NOT use Break-In Oil because it is NOT needed. All engine parts, including rings will break-in perfectly fine with normal oil. No oil on earth can stop parts from breaking-in. Because microscopic high points on any part will immediately wear down as required for the part to support the load applied to it.

Remember, rings are forced out against the cylinder walls by combustion pressure behind them in their backspace between the ID of the ring and the piston's ring groove back wall. That's how rings are designed.

If an engine has any trouble breaking-in, it was not built correctly. Period.

Break-In oils are the absolute worst oils on the market, because they provide dangerously little wear protection. Many engines have been ruined during break-in because of people using those worthless oils. And the people involved want to blame everything in the world other than the oil. They just don't know, what they don't know.

540 RAT

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