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Good to know about Driven. I have been using SWEPCO 306 20w-50 in my air cooled race engines for years.
Have now switched to Motul for my 2015 Cayman GTS based on previous recommendation from Charles.
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Steve- 62 356 S90 Sunroof-sold 11/16 
73 911 No longer Targa-3.2L Running GT4
88 Carrera G50 sold 2019
2015 Cayman GTS
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