![]() ![]() Some break-in oils are designed to accelerate the break-in process, and as a result, these oils generate higher levels of wear metal-bad news for your roller bearings. Quite simply, not all break-in oils are the same. ![]() So what does this have to do with motor oil? In fact the “normal” wear metals for a new engine are up to four times higher than after a engine has finished breaking-in-hence the term “breaking-in.” An engine creates more particulate wear metal during break-in than at any other time. According to Timken, the number-one reason for premature roller bearing failure is particulate contamination. While the rings need to be seated in a roller, an oil that “wears-in” the rings will create a lot of fine metal particulate, and that particulate is a killer for your roller cam. ![]() By now, it’s common practice (or should be) to use break-in oil with ZDDP or a zinc additive for a flat-tappet camshaft.īut what about roller cams? Any old oil will work for that, right?Īccording top engine builders, ring manufacturers, and cam grinders, the answer is no.
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