Quote:
Originally Posted by lapsio
Though what was quite interesting to me - engine is noticeably louder and sounds harsher than with 10w50.
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Not uncommon. In fact, of a few crusades for the 'perfect oil' I've come across oils that run louder and quieter than the factory fill, all within the same viscosity. The impression I always got was that quiet was good, but this wasn't true at all. The quietest oil on one test actually had the worst UOA results, by a lot. Since then, I take sounds as just interesting observational note, since it seems to have no bearing on performance/wear. It's counter intuitive, but that's the way life works sometimes.
Might be worth trying a couple of different brands. High quality brands of course.