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    Mineral oil in Volvo Penta 5.0 GXIE-P , V8 ?

    I would appreciate some feed-back from You guys. My mechanic recently changed the oil and the filter. I have always used Volvo Penta 5W-30 Synthetic oil. However they have now used Valvoline All-Fleet Extra 15W-40 which according to my understanding is a mineral oil, primarily for diesel...
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