hanschristian.org

All good advice Mimoza!

Yes, a diesel should really be run at 80% of it's continuous rated RPM 80% of the time in order to assure full life span.

And of course regular oil changes, especially at the end of the season if the boat is not going to have the engine started all winter.

And yes, for older diesels designed in the era of high sulpher fuels, a lubricity additive (e.g. Stanadine Performance Formula) is essential to long (mechanical) injection pump life.

http://www.stanadyne.com/view.php?id=74

~Cars

I can't help you with the engine but some tips on the tank. You should drain and clean the tanks in order to inspect them. That is the only way you will know what shape they are in. If they have been kept clean and free of water they could be in excellent shape. If they have been neglected they could be rusting from the inside out. Much also depends on how they are mounted. If they are in the open and mounted on material that does not hold moisture they could very well be in good shape.However, if they are surrounded by foam or mounted against wood they could be in bad shape. Can't be more specific than that. You just need to inspect them very carefully.