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How long do you intend to keep it? Oil change interval affects engine life at the end, not beginning. If you get rid of it at 100k, it might be fine with 1 or 2 changes on syntetic. You would never see the effects. If you want to drve it untill the engine is dead, change that [bleep] often. And remembet, if you want to protect your engine, you need to be dropping good oil out of it, not used up crap.
This will most likely be my last truck.
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I normally go 5k with full synthetic on my previous vehicles. A guy at work has a Dodge diesel and he goes 25k on his oil changes using Amsoil. He has almost 300k on the engine with no issues and he has sent samples in to get tested.
Honestly I am a little leery of a 10k interval nevermind 25k.
