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New owner, first oil change. 79' 911 SC. Location: CT. Current Temp Range: 30's-70's, Summer temp range: 40-100. Ive decided to use either Swepco or BP 15W40 or 20W50. Any recommendation on those combinations? The car also leaks oil once warmed up to hot. for this purpose I was thinking 20W50, but read that 15W40 is better with keeping oil temps consistently lower. Any suggestions?
Also cant decide on either of the brand.
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