Hehehe, you lucky sucka.... if I didn't have a kid I'd be driving a 350 too... but one look behind the drivers seat - and I knew I couldn't do it. (cause theres no room in the 350 at all!!)
Tell the buyer the X only uses 3.5 quarts per change and mobil 1 can go for longer change intervals... it works out to be pretty close to running conventional sometimes... but theres no issues with switching back.
-=RB
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Happiness is found with a larger engine.