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Old 14-03-2016, 00:57   #1
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Join Date: Mar 2012
Location: Nelson NZ; boat in Brisbane
Boat: 45ft Ketch
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400hours between oil changes for Cruising

The often recommended 100hrs ODI (Oil drain interval) seemed a bit nuts for an ocean voyage by motor-sailer where the motor is run for long periods in a dust free environment and very few cold starts. Just like long distance highway trucking.
This article suggests I'm right.
Fig. 3 says ODI ranging from 18,000 miles to 40,000 miles.
Figure 6 paints a simple picture which puts the motor-sailer ODI at 400 hours and no mid-ocean oil change.

Optimizing Oil Change Intervals in Heavy-Duty Vehicles

Of course there will be day sailers whose engines mostly run cold and would do better with 50hrs ODI
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