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HelloCustomeron the oldsmobile aleros the head gaskets don't generally go bad but when they do it's on the right rear of the engine block. The one thing that you want to keep an eye on is the lower intake manifold gaskets. Over time they tend to leak causing an antifreeze smell and possibly over heating the engine. I have done several of these and have seen it numerous times. I would also check out the lower control arm bushings they look like a round hockey puck they like to separate from the control arm. As far as everything else it's just the basic routine maintence parts i hope this has been of some help to you. If you have any more questions please ask.
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