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    Valvoline VR1 - mixing viscosities

    Hi, I registered on this forum, because it seems to be the best place for oil related questions. The car is a 1990 Porsche 944 S2. I've been running Valvoline VR1 20w50 for 2-3 years. It works well in the spring/summer/fall and I've usually hibernated the car in winter. However, things have...
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