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Every engine manifacture has a different specification which may change between diffent models but for instance MTU from memory which is a couple of years now does the following
W1 Daily checks, oil level, coolant level, general visual check
W2 250 - 500 hours depending on model and if bypass filters are fitted
an Oil & Filter change
W3 1000 hours adjust valves check injectors
W4 2500 hours water pumps and other ancillary equipment serviced
W5 5000 hours essentualy strip top end
W6 10 000 hours total rebuild
each level also includeds the previous levels of maintenance.
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