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I've been using Delo 100 40W in our older Pathfinder. Our manual says to change the oil and filter every 100 engine ours, but on a sailboat that could take a long time in getting a 100 hours on an engine. Acids build up when oil sits in a diesel for to long (not good for the engine), so I change out the oil and filter every 3 months wheather I hit 100 hours or not.
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