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EJ,
It hasn't been that many years ago that 20W-20 Mogil oil was the 'standard' for winter use, in any climate but the Artic regions! And then a couple of decades later, 20W-40 grades came out! And, even later,
around 1970, Shell came out with a miraculous 10W-50! Must have had distribution problems or customer resistance to pricing, though ... didn't last long or at least Shell stopped pushing it in their ads!!!
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Warren Hall
1973 911S Targa
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