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Oil going missing but no leak

Brought my beater in because car is lossing oil roughly 5 quarts every 700 miles and no puddle anywhere.

There’s leaks around the cap and on the engine cover. Also on some of the parts as i assume it’s probably leaked 50+ quarts.

I did change PCV valve and that didn’t do anything. There is a massive blow by from the engine. And the tailpipe is a little black but if it’s burning a lot of oil it should be worse.

I thought potentially the valve cover was really bad but to much oil for there to be that of a massive leak according to the mechanic.

Where do I start diagnosing next.

2001 Toyota Corolla

IF there are no visible leaks, the engine must be burning the oil and it is fouling up the catalytic converter. It’s also possible that once the engine is running and up to highway speed the oil is forced out and left on the road. You need to tell us if any part of the engine are wet with oil.

In that case, if the engine is actually burning that much oil, your engine is on its last legs. .With a 19 year old car, any expensive repairs are a waste of money and I would just drive it until it dies.

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you are using 1qt/100miles? always see folks on CL giving away waste oil. you should talk to them

The vehicle for sale sites on the web . This thing is toast .

Sorry to hear of your misfortune. I have the 2002 and many of them do burn oil, and as badly as yours is described. It can be fixed by a skilled + brave DIYer but since you describe it as your “beater” car, I would not make the effort.

Here is the best information regarding your situation: https://www.toyotanation.com/threads/diy-oil-consumption-fix.402362/

Add a can of this to the engine oil.

https://www.restoreusa.com/index.php

If the oil consumption slows down or stops, the rings/cylinders are worn.

Tester

You can do a wet and dry compression test to check your rings. I suspect you’ll find bad rings because you have blowback.

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