Thought some of you might like to see an oil sample for our motors. I don't think I've seen one posted here before but the link below will take you to my latest. This was a 9,500 mile interval on NAPA Synthetic which is allegedly the same as Valvoline. I've historically used Mobil 1 but have occasionally used this NAPA oil due to the terrific deal (usually sub $20 with a filter). Either way, it seems to hold up very well and they recommended going 11k next time, but I'll be keeping it around 10k.
Blackstone apparently lost my previous samples since they mention that this is my first sample and didn't report my previous ones. This was actually the third sample I've run on the PF, all with very similar results. The first was around 50k miles at a 7,500 interval on Mobil 1. Second was at 80k using Mobil 1 at a 10k interval, and this one at 125k. I mainly do the samples to check for any potential issues with the engine. I was actually expecting this one to be a bit less impressive given the cheaper oil and the fact the engine is getting on in age.
http://imgur.com/z0TJnL3