Quote:
Originally Posted by ParkerFE
Following the on-board service reminder is sufficient for the long life of a Porsche as long as you use a high quality synthetic oil.
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I would not bet on that; Porsche has been all over the map on service intervals for oil. and various times going 12K, 15K, and even 20K. Yet used oil analysis has shown that in many cases that is way too far.
If you want to know the ideal "sweet spot" to change the oil in your car for optimum engine protection, the best way is by taking UOA samples at intervals and seeing when your oil demonstrates a 50% drop in TBN values from fresh, indicating that the additive package which controls the oil viscosity is on the way out. At that point, the oil will no longer demonstrate its advertised weight, commonly known in the industry as "falling out of grade".