In LA, whose climate is similar to San Antonio, I use Mobil 1 10-40 High Mileage. Its heavy enough for the summer temps and has a good additive package (hence the high mileage name).
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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