Sorry about the tone of my responses, MSMITH. Didn't mean to offend anyone and I do appreciate all the constructive responses.'
Thought I had given enough facts in my opening post, but apparently not:
1. This gentleman lives in the RV park which my wife & I have owned since 1997.
2. He bought this Itasca in March 1996, and moved into our park in mid-1997 when the MH was approx. 1 1/2 years old. He bought a park model which he has considered his home base ever since, so I have known him and this motorhome for the last 17 years or so.
Also know his appreciation of proper maintenance, and running the engine weekly, he thought was doing it good.
Occasionally one of his 2 sons who lives near us would bring out a couple of 5-gallon cans of diesel they would dump into the 40-gallon coach tank.
We have an asphalt-paved storage area in the back section of our park; that's where he stored it.
Thanks again for all the advice. The maintenance technician is coming by tomorrow to inspect it and give his comments. I expect to take the gentleman a check before this time tomorrow PM.