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Based on my research the Porsche oil is the only one that eliminates the cold shift issues. Some of the other oils aren't cheap either. Spend the big $$$ once and be done with it. As soon as spring arrives I'll pump in the Porsche stuff and know for sure. I'm running Royal Purple right now.
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'58 356A coupe, just a driver
'00 Boxster S fair weather - daily driver
'11 Jeep Grand Cherokee Limited - winter daily driver
'92 F250 - junk hauler; previous Porsches '95 993;'08 Cayman S;'70 911E
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