Maintenance interval generator
Pick the engine family and get the service schedule that actually keeps these engines alive, with the reason behind each interval and which items are safety rather than housekeeping.
These are typical published intervals for the family, not your engine's schedule. The manual for your specific engine, in the variant and rating you own, is the only authority. Where the two disagree, the manual wins.
Calendar beats hours on a boat and miles on a classic. An engine that runs 40 hours a year spends the other 8,700 sitting still, and sitting still is what corrodes exhaust elbows, sets impellers, dries hoses and lets acids sit in old oil. Almost every interval below has an "or annually" clause for that reason.
The consumables an old boat eats
The pre-purchase inspection kit for your boat
Buying, not just servicing? Ask the seller for receipts against this schedule. The kit turns the gaps in those receipts into a number you can take off the asking price.
See the inspection kits