I did a quick search but didnt really come up with an answer. I normally just follow the maintenance minder for oil changed and what not. But should I still follow it when using Synthetic oil? I'm at around 9500miles and the minder is on 15%... just wondering if I should still follow the minder? or just use my own calculations? I did the oil change around 5000miles... so its been 4500miles on synthetic..