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<p>[QUOTE=&quot;Frank Speak, post: 11426105, member: 181425&quot;]For the non mechanic (that would be me), I have to ask, why are you looking at fuel pressure when you’re worried about oil usage? Wouldn’t you pay more attention to oil pressure?</p><p><br /></p><p>Related, I drive a Peterbilt 389 and&nbsp; with fresh oil, the oil pressure is around 60 psi at 70 or so mph. The older the oil, the less pressure until it gets close to service being due where it ends up at around 40 psi at 70 or so mph.</p><p><br /></p><p>I told the boss man (owner of the truck) about this and he says it’s fine. They’ve had the oil analyzed at different mileages and said it’s good to go.</p><p><br /></p><p>Go figure...[/QUOTE]</p><p><br /></p>

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