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My 5.4L has over 220,000 miles on it and is finally wearing out, but it has never needed oil added between changes. That is even with a change or three being streched out to 15,000+ miles with dino. I just didn't pay attention and run it long. Never added a drop.
your a brave soul going 15k on an oil change. all my vehicles I owned were changed every 3k.
I normally go 5000 miles, but with the truck at that time it was pure highway miles. And it might have hurt in the long run, noone should complain about getting ONLY 220,000 miles out of a motor (Ha, Ha), but I will never know what I COULD have gotten if I had taken better care of it. Wait, it is still running now, sounds bad, but it is running.
You can say that, it sounds like a PSD and won't hold oil pressure at idle. The bottom is getting ready to come out of it. Check out my other treads "Clean truck in Gallery", "Low oil pressure, Problem??"
Ha! Sorry - "dino oil" is short for "dinosaur oil", which is to say regular oil pumped from beneath the earth. Some of the modern oils are "synthetic" and are fabricated somehow to be more consistent or to have smaller molecules or whatever. So "dino oil" just means the regular oil you can buy for usually just a couple of bucks per quart, as opposed to the expensive stuff that sells for $6 a quart.
Well many people on these forums - myself included - have found that the V10 engines will burn the synthetic oil much faster than dino oil. It isn't so much a matter of cost, but whether you are comfortable with an engine that burns oil.