I know oil tends to be a personal choice kinda thing, but when Rotella pops up 90% of the time, it can't be that bad. What are your thoughts on T4? I don't believe I've ever heard a bad review on it, and based on the price it would be hard to beat. Thinking on giving it a try since I change oil about every 5,000 miles anyway. O'Reilly's has it on sale for $16, add a Wix filter, and I should be set.