The seller is going to drive over to my house, so I'll be able to put it up on ramps and get a good look at what's going on. I'll definitely be looking at the oil pan gasket since that's a PITA to change. He said that he just had the belt tensioner and water pump changed. I'll do a cooling system pressure check since the water pump replacement makes me think that he might have gotten the engine hot enough to damage the gasket. Anything else? It's a 1986 model which from what I've read is better than the '84 and '85. Thanks

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'81 300SD