Just out of curiosity,
If you search about 'roller' style cams and break in oils, you find stuff like this,
https://www.corvetteforum.com/forums...post1593096911
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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.
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Quote:
Oil Company claims about the benefit of high zinc levels in motor oil is NOT based on actual fact. Extra zinc cannot physically provide extra wear protection, because zinc simply DOES NOT work that way. Zinc is used up a little at a time as it is sacrificed to help protect against wear. More zinc will take longer to become depleted, simply because there is more there to use up. It’s the same idea as more gas in your tank will take longer to run out, but more gas in your tank cannot physically make more HP.
These high zinc motor oil producing Oil Companies NEVER provide any test data to prove that their high zinc oils always provide better wear protection than ordinary modern low zinc street oils. They can’t do it, because it’s NOT TRUE. So, high zinc believers are only embracing smoke and mirrors, nothing else. And actual dynamic motor oil friction tests under load, PROVE that the need for high zinc levels is simply NOT TRUE. That is why I started testing motor oil, so that I could separate the facts from the fiction.
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You can also find alot of info from people suggesting the use of 'break in oils' and so forth.
It goes both ways on the sea of internetz.
Personally after everything I've seen and done, i.e. using new and used roller cams and sr20 cams with straight synthetic and no issues, this is how I play the game to this day. My simple claim is that, if the part can be moved from engine to engine, then it does not contain any established personalized wear pattern, and thus the use of synthetic motor oil is indifferent/inconsequential. Basically the less it wears the better, and synthetic does a great job of preventing wear. I think break in oil is a mistake in this instance.