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Hey Superman,
I don't think your 20 minute drive is long enough to get the oil up to 'normal' in 25 degree F weather! And that is not cold enough to justify changing oil grades ... even if you could get some of that 0W-40 European oil, it would just mean you have got 12 qt. of cold 0W-40 oil circulating around after 20 minutes ... nothing wrong with 20W-50 in those temps of yours!
And, I'm sure you are just experiencing a bit of 'fixation on the oil temp gauge' syndrome, hoping nothing goes into the red because of that leaking thermostat O-ring! Nothing wrong with paying attention to the temp gauge, and I bet your extended test this evening will get it up to 180 F ... just like normal! Good luck!
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Warren Hall
1973 911S Targa
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