1988 Buick LeSabre. 185k. Pizza car = 3000 miles every six weeks. So
here's the thing. I'm going through almost 2 extra qts of oil every
3000k. No drips. No muddy oil. No dirty/contaminated coolant. No
odor. No smoke on start-up. No smoke in rearview mirror. Can this
simply be the age of the car/rings and the type of driving? Seems like
it has to be. Typical or not? Been like this under same conditions
for...geesh...2+ years with no performance changes. Thanks.
Sometimes small leaks are very hard to see, but they will account for
substantial oil losses. This could be below the engine, such as
oil pan loose or gasket damaged, front crank seal leaking, rear main
seal leaking, etc. Dripping valve cover gaskets can also account for
a lot of oil, and you may not see it unless you intentionally look for it.
If you are actually burning oil, a catalytic converter which is functioning
well can hide some of the blue smoke which used to clearly identify
an 'oil burner'. The converter will, however, soon be inactivated if
large quantities of oil are fed to it.
That age of car.....I wouldn't spend too much time trying to
fix that kind of oil consumption. Just make sure you aren't
overfilling the engine oil. 1500 miles for a quart isn't really
that bad, you should see what the Northstars gobble up.
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