I was running Mobil 1 until I found out they had switched to group III. I still think it`s the best oil for the price and you should use nothing less. However, I`ve switched to Royal Purple to see how that works out, I`ll be find out on the next oil change. I put 10w40 in my Stealth and 10w30 in the GTC. The transmission in the Stealth is going to get SyncroMax while I`m just going to use straight 10w30 in the GTCs transmission. The t-case and the rear gearbox are getting MaxGear. As for filter, anything but Fram, but I tend to stick with Mobil 1 or K&N filters.
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