Originally Posted by buster
I agree.
LOL Yes technically speaking I failed to get the oil changed. I knew it was due but I didn't think going over by 1,700 miles would be an issue. As I stated too I really don't know what caused it and a UOA would certainly help.
I know this is coming from XOM, but one of the things you'll find with less capable oils is that they are not that great at resisting oxidation over longer drain intervals. If I had to guess, that's what I'm seeing. I've also seen PP thicken when the oil gets tested in more demaning situations. Again though, I'm not saying definitively that Valvoline failed. It's possible, but it's also possible there is something else going on. In hindsight, Maxlife FS would have been a better choice the last time the car was serviced at VOIC.
Right. I can't speak to your specific vehicle but in general, I would do a series of UOA's to establish whether or not my ride was a good candidate for extended drain intervals. For a number of different reasons (eg. excessive blow by), not all vehicles are (good candidates).