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(Maybe it's my old thinking but I still keep at 3000 miles despite the fact my service van is mostly highway miles.[/QUOTE]
My service vans used to hit the highways every day. I changed THE FILTER at 5000 and the oil & filter at 10,000...no kidding One of them has 300,000 miles on it and is still running. I gave it to a friend. It was a Dodge and they are famous for defective oil pressure sending units...the oil light has been ON for 8 years...laughter. I pulled 8000 lb. loads with a 318 cu.in. engine that had 300,000 miles on it and did so just last year...huge steel trailer FULL of firewood and once half full of concrete, I shudder to think of what THAT weighed...being in hilly country, that load to the dump was in first gear 1/3 of the time. The oil held up even though that red light was BRIGHT! laughter
Almost all cars will not be affected by 5000 mile intervals if you drive them on the highways mostly. The oils today are excellent.
I am 71 years old and I don't trust the synthetics and won't pay the price...wayyy to spendy.
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