Always a matter of judgrment other than the compression test. Always run the engine if possible till totally warmed up. This to see if there are some potential headgasket issues or cooling issues. . Oil pressure status and any abnormal increase in noise. Buying from a good type seller is usually very important as well. I in fact rate that as really important.

For example I will not sell anyone anything that does not meet what limited standards I believe should be present. Or if the item does not meet them a full disclosure of what I think. The judgement aspect varies between individuals.

Check the coolant for bubbles or oil. Check the oil for normal apearance. If more money is involved than one would be really comforatable with perhaps an oil test. I suspect you are already well aware of the mentioned items.

It is like my finding the really good 602 engine in a ratty but roadworthy except for the front wheel bearing 190d car the other day. It was the strongpoint besides the five speed manual. I am considering going back and offering 500.00 for the whole car. He dropped to eight hundred from a thousand easily.

I might have to buy a good lower milage 190 gas with a bad engine and drop the diesel package in. I really do not want to bring that fixer upper back to good shape. Good gas 190s are now going cheap enough the equation might work.