Hi Everyone, I'm looking to buy an RV (bus) with a 1990 E-350 diesel engine. I *think* it's a 7.3 non powerstroke but am not 100% sure. It has 145k miles, and has been maintained by a local gov agency every 4k. Does anyone have experience with this type of make/model? Will an older diesel engine (20+ years) be dependable if taken care of? Any known problems with these engines? I've seen that they have thin cyl. walls...anything else? Any help would be greatly appreciated!