"Additionally, synthetic does not break down like oil did in the past. I have heard stories of experiments where cars were run 200k miles with no oil change, and the synthetic was tested afterward, demonstrating NO thermal breakdown or reduced lubricating capacity. Not to mention it was as clean as new."
I think you have a few facts wrong here. The 200K stories are when using synthetics at regular oil change intervals. The data is clear that synthetics are superior to DINO in everyway. However, even AMSOIL recommends a MAX of 25K on their oil. I use Mobil 1 in my Buell and even at 2500 mile changes, I can tell you that the oil is NOT clean as new. That is a myth.
Ditto-Red Line and AMSOIL. The DOES get dirty, however, their is no disputing that SYN is good stuff.
RE: the 7500, I simply don't feel OK on the 20K but it is my personal preference more than anything. However, you should know that Porsche replaces more than their fair share of engines. And if you are out of warranty, why chance the engine going south over the cost of an oil change?
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