I personally think that anything like this is "snake oil". If something sounds too good to be true, it usually is. Although it sounds interesting if it were me, I would stick to what Porsche says and follow their recommendations. After all, I think Porsche knows their cars. But again, that's just me.

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My Pictures My Cayman S

My Porsche Cars

2007 Cayman S
2006 Cayenne S Titanium Edition
1982 944 (Amoung first shipment to come to US; number 6 off the boat)