Now, if it's a diesel you were talking about, it wouldn't matter so much because one way (15w40) or the other (diesel fuel), it's just fuel to the engine. It all compresses and ignites and propels the car. Maybe you could lean back the IP delivery if you knew you were getting a little enrichment from the valves. But I guess things could get crazy if you bleed too much in through valves, and get a run away.
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Cheers!
Scott McPhee
1987 300D
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