I've got a 92 Stanza, its got 179k miles on it and it burns oil, about a quart a week. Should I just try and use some 20w-50 and squeeze life out of it or should I just break down and replace or rebuild the engine?
Be 100% sure its burning and not leaking before you rebuild or buy another engine. Sometimes just replacing the rings or valve seals can do the job if its burning. but using thicker oil will just solve your problems temporarily and may cause other problems inthe future.
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Does your car smoke? When I retired my sentra it was eating about a quart every 2-4 days (lots of miles, though), definetely more than half was just leaking out, and even then whatever it managed to burn was enough to put smoke grenades to shame. Unless you have a lot of visible smoke, it has to be leaking out, IMO.
if it needs a motor, those are fairly easy engines to replace. You can find a used motor for that car at a salvage yard or something like that for about 400 or 500 bucks(where i live anyway), call around different places and get prices.