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If you drive alot of highway miles a reasonable interval would be oil and filter every 5,000 miles. I used to do that for about 170,000 miles and I've switched to changing oil and filter every 2,500 miles.
I bought a case of 10 Mann Filters for $39.50 and I buy Brand name regular oil on sale (Today I bought a case of Citgo 10w30 for 74 cents a quart.)
The whole oil change works out to be less than $7.00 bucks a pop.
Every 2,500 miles is a little often (for me about every 6 weeks) but my oil and engine are so clean I sometimes have a hard time reading the dipstick. I'm at 220,000 miles on my 86 240 and still running smooth.
PS: Don't forget to change the flame trap and clean out the associated plumbing on a regular basis also.
Regards,
Jack W.
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