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Originally Posted by JFP in PA
Nonsense; we have been using 10W-40 Castrol Syntec in customer cars for a long time and it gets plenty cold here as well. And, when you look back a few years, 10W oil was the recommended grade for arctic conditions, so why should it be a problem now?.
I never could justify the OEM rationale for 0W – anything, especially considering how poorly their “chosen” oil performs in used oil analysis after mild usage and low mileage conditions………..
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Congrats, JFP, you know more than the Porsche engineers! That's awesome!!
When was the last time you read an updated Oil TSB from Porsche?
Do you disclose to your customers that you are using outdated unapproved Porsche oils? They deserve to know and be informed.