Letting diesel rv sit for 3 months

Diesel engines are self oiling for storage. 1000’s of pieces of ag and construction equipment sit for months in the “off seasons” without harm. A biocide in the fuel, as suggested, is a good idea in a warm climate.

I,ve done this meney a times no problem. a diesel is not a gas engine. our little dozor sat in a field for over a year , new batteries cleaned fuel bowl and started almost right up,, cranked about 15seconds then came to life. your motors will be just fine.

I wouldn't worry about a thing for 3 months other than maybe a battery tender to combat any small draws on the battery.

Our tractors sit for 6 months at a time and don't have problems.

Everything Wolfe said. And do relax. There are a lot of us in the snowbelt who by necessity have to park their RVs for 6 months or so while that pesky white stuff covers the ground. No harm as long as you do some basics. Mine starts right up every time in the Spring after 15 years of winter naps.

The "highly recommended":

Add a BIOCIDE such as Biobar JF to prevent algae growth.

Fully fill the fuel tank to minimize condensation.

Yes, driving it would be beneficial. BUT only if you can drive a minimum of 25 highway miles-- enough to get the oil, not just coolant up to operating temperature. Anything less will just add moisture to the crankcase.