Oilguard filter question
I have a 1997 F350 PSD with about 120,000 miles and Oilguard bypass filter system. I've just had my first oil analysis performed with about 4200 miles on Rotella 10w-40 oil, which came back clean.
I'm getting some conflicting information about changing the filter elements. Oilguard recommends changing both the filter elements when the oil is changed. However, the person I spoke to at Lubetrak recommends changing the bypass filter element at 5,000 mile intervals, adding make-up oil, then changing the oil and both filters at 20,000 miles (with testing, of course).
This is the first vehicle I've had with bypass filtration and I want to make sure I service it properly. Thanks.
The bottom line is, changing the filters / oil as much as some do is a waste of $$.



