Oil burning is probably the most common issue in an 98-02 Corolla. Everything you're describing is some of the same issues I've had. I've got about 150k miles on my Corolla and haven't done much (as far as taken to mechanic) to do anything about this issue besides replace the cat when the CEL came on. I have used engine cleaning oil additives and they can do a bit to help clean up the engine but aren't a professional cleaning job. Piston rings is the most common answer for why this is happening, but I've heard other responses as well. If you're concerned with it then I'd take it to a mechanic but I can say that as long as this has been happening to me.I probably won't take it anywhere to have it cleaned anytime soon. Regardless, make sure you keep the oil levels within tolerance (3.7Q is what the engine is supposed to have in it apparently).
Here's the list of things I've tried:
-Wal-Mart Injector cleaners
-plain dinosaur oil
-Auto-RX (this is what I'm currently on)
Of all of them, the Ceramizer increased fuel economy and seemed to increase HP (look it up and you'll find it may help with your compression problem).
The Engine Flush seemed to do the most work in the least time (run for 5-10 minutes before you change oil at idle speed after adding the flush to your oil reservoir) but only made a difference for about 2 weeks after each change.
Full Synthetics helped to keep the engine quieter, while it also seemed to burn much more quickly.
Lighter oil seems to burn more but also seemed to keep the engine feeling slightly more peppy.
Heavier old didn't burn as quickly but made my car harder starting in the colder months.
CD-2 is an oil detergent and did seem to help a bit; I ran it in my car for about 3 weeks and then changed the oil (and found the oil DID come out very black and the oil filter WAS heavier than the control filter on my other '01 Corolla-indicating higher amounts of debris trapped) at 1400 miles since last change (yes, changed it VERY early).
CerMet was snake oil and I wouldn't recommend (ounce per ounce it's about the same price as gold, or was when I bought it).
Injector cleaners didn't do a thing.
The Auto-RX has only been in my car for about a week now so it's too early to tell if I bought more snake oil or not.
And the plain dino oil? Why buy the expensive stuff if it's just gonna burn off anyway? =]
Monday, October 9th, 2017 AT 10:11 AM