- Sep 26, 2010
I recently switched from PP 5w-20 to QSUD 5w-20 in this car and the QSUD seems to be working just fine, so I will make this a permanent switch for as long as QSUD remains cheaper than PP. The one thing that Blackstone flagged in both UOAs was the silicon levels. In the first OC, the filter definitely needed to be changed and so I did, but I was surprised to see the silicon levels increase some. I will check the housing/tubing for a leak and perhaps use some grease on the edges of the filter and the connections. Any thoughts on where the silicon could be coming in would be welcome as well as any other thoughts or comments.