![]() ![]() So more isn't better - in fact more can be worse!! and adding additives to a good oil can turn it into a bad oil. That is also mentioned here in 540rat's blog. ![]() I will toss in here information I found from a test done by a university in conjunction with oil research - that the protective layer formed by zddp does not keep building - it reaches a point and stops. He also discusses that at length - and why the factory recommends a less ideal oil (5w-20) - that's because of CAFE rules. This guy has done enough testing and gathered enough information from research around the world to also show that generally speaking - GENERALLY, not meaning ALL, but for the most part all else being equal, that most modern engines in good condition do best with 5w-30 oil. ![]() Place holder for factual information related to engine oil viscosity or "weights" and wear resistance testing. ![]()
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