I'm about to hit 150K miles and have been changing the oil regularly at 7,500 miles with Pennzoil Ultra Platinum. I'm wondering if it's time to switch to a high-mileage oil. Does anybody have any experience/thoughts with doing this? Thanks.

 

I regularly used high mileage oil on my 850T (retired at 250K miles). The high mileage oils contain seal softeners which on the older engines helps minimize weeping and leaks through the seals. Its also important to make sure your PCV system is properly serviced before it clogs and pushes oil out the seals.

 

I had the PCV Flame trap box replaced at around 95K miles.