MercedesNEWB

Hello everyone, this is my first post here. I am inheriting a 1989 190E. The car has been sitting for going on 3 years now! Everything suspension wise was replaced before that, so that is all good. It is my aunts car. Someone told her that a piston was stuck and the car was a crusher. Well I put a battery in the car 3 days ago, sprayed some starting fluid in the intake and it started up. Old gas and all. The motor didn't make to many wild sounds. I sounded like all six cylinders were firing and moving okay. Sounded like a slight knock, which I am assuming is from sitting for so long. New oil should clear that up.
I am wondering what I should check on the motor before firing it up again. I will be doing a compression test first, if that turns out well I will be replacing spark plugs, fuel fitler, fuel, oil, filter, air filter etc. Just wondering if there is anything particular I should check. I have never even driven a Mercedes before. So I have no clue what to look for, but I do know my way around cars pretty well. Can someone tell me what are acceptable plugs to use? As well as what oil these straight six's enjoy consuming!

Thanks everyone, sorry for the long read. Thanks all for the input as well. I hope my Mercedes adventure turns into a good one.

MTI

Before you even money on even spark plugs . . .

Three years is a long time for any car to just sit. I have to guess that if the tires were still on, they are likely "square" on one spot.

Rust can form in a gas tank, or at the least, leave sediment and gunk at the in-tank screen and fuel pump(s) filter.

Someone that knows, perhaps a Mercedes knowledgable person or mechanic should look beneath the car or put it on a rack so that the "life safety" systems can be inspected; particularly the brakes; ball joints, rods and strut arms. Even if they were new three years ago, just sitting around can affect them.

Finally, check your bank account.

MercedesNEWB

CORRECTION, it is a 1988 300E. Whoops, just found that out.