Before I knew a little bit more about what the "10" and the "30" meant in the oil designation, I tried 10w40. Tapping seem to get worse. It wasn't Mobil. Maybe I'll have better luck using it.

Been using Bosch oil filter. Will try Mann and go from there.

Thanks

This happens infrequently when car has warmed up esp. in hot weather. Is there a motor flush that Volvo recommends to clean engine? I change oil regularly (3000 mi intervals). Is there a different weight of oil that I can use to quiet tapping? Using 5w30 synthetic now.

Thanks