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I know that in an aircraft that is operated for hire the oil and filter must be changed every 50 hours of flight time. UNLESS you use an approved full synthetic oil (read Mobile 1) then you can go 200 hours between oil changes provided the filter is changed at 50. 4 times longer, good enough for the FAA, good enough for me.
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If I get the one I'm after and two more I'll have three. - Ed Zern
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