First time I heard of this theory... IMS

[truegearhead]

I've owned my Boxster for 8 years now and it's seen hundreds of autocrosses and 20 or so track days. I've replaced the ims and the rear main seal, the theory i subscribe to is if you don't change the oil regularly, easpecially if it gets hot the oil losses viscosity and the rear main starts to leak and ends up in the ims. I'll admit I've stretch oil changes before and once did three full (5 hours/day track days), in both instances the new rms started to leak. Changing the oil stops the leak. I think Boxsters are really susceptible to old/worn out oil. If you change the oil regularly I think you're in the clear. This is not a new theory, but I don't think it gets enough attention. Interestingly I run with a group of guys that have all sorts of cars, the Boxster motor has been by far the most reliable. If taken care of I think it can take far more punishment than most engines.