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It may well be the rings. GM keeps trying to use ever-lower tension rings, in a quest for reduced friction and improved fuel mileage. The finish spec that most new manufacturers are putting on their cylinder bores is completely adequate for using synthetic from the beginning, IMO. Rebuilds are...

Japanese vehicles have been more reliable than European vehicles for a long time. I use Mobil 1 5W-30 and Purolator PureOne filters in my 2002 TL-S. I use an oversized filter (Purolator P/N 24458), instead of the smaller one specified. My car also calls for 5W-20, but living in FL, I...