Originally Posted by
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So with the advent of modern lubricants, why can’t recommended TBO’s go to 3000 hours and 15 years?
A. not all old engines runs well on modern lubricants
B. somebody has to talk to troglodytes in administration
C. the engine manufacturer has to actively throw money for recertification of engines they don't want to survive - all below 5xx displacement is PITA to make profit from