My summer toy is a Porsche Boxster 987 3.2S, the perceived wisdom to stop the engines going 'bang' is to double up on oil changes. It's relatively common practice for us to use Kwik Fit for this as they usually use Mobil 1 fully synthetic and an OEM filter, all for 25-33% of the price of an OPC.
Kwik Fit use an oil change as a loss leader to get you in the door in the hope of getting other, more profitable,work whilst you are there).
I wouldn't use them for a proper service, however, for an oil change, it's a no brainer.
I hang around whilst they do it though.
