Quote:
Originally Posted by andaconda
I know, I know...
But I've always had good luck doing it this way.
As for oil brands --- each to his own. I think any name brand is ok.
I work in a fleet shop and have used the cheapest oil that is bid out.
We change at 3000 miles and most of our vehicles go 2 and 3 hundred thousand miles without any engine problems. Now that's on the least expensive 5w30 oil that we can find. 
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Double the oil change interval on one or two of your fleet vehicles and see if there is any noticeable difference after 250k.if no difference tell your boss you have a great way of saving the company some money and its also good for the environment.