Synthetic engine oil merely reprocessed petro oil?
I have a 1984 MBZ 300D Turbo. A mechanic I went to today told me that the synthetic oil I can buy is not as good as the synth oil he gets. He said the stuff I can buy is merely reprocessed petroleum oil. That sounds like pure BS to me, but I need backup.
Also, for that 1984 MBZ 300D living in San Francisco, what synthetic oil should I use? Temps range between 30 to 85F. Right now the coldest nights are about 45F.
Thank you,
Paul
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1984 300D Turbo
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