"you know more than the Porsche engineers! That's awesome!!"
Unfortunately, the Porsche engineers had to work with what the accountants and marketing dept gave them...which is why we have d-chunk engines, weak IMS bearings, weak cam tensioners, broken cheap plastic pieces and on and on and on.
I don't question folks like JFP, Jake and Charles because they represent "real world" not factory hype. Porsche wouldn't even admit the problems with the M96 engine design; do you think they care about the oil they recommend other than who's paying them the big marketing dollars? I remember when all my Porsches came with Shell stickers as factory fill.
I use Castol Syntec 10W40 and recently paid $4.99 qt at AutoZone...I wouldn't put Mobil 1 0W40 in my lawn tractor.
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JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95
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