Originally Posted By: 440Magnum
Originally Posted By: garlicbreadman
my friends 97 civic has about 250k miles and its consuming maybe 1 quart every 2k miles. He lives in San Francisco, so temps are usually from 50-70f. I was thinking Valvoline Maxlife 10w30.
Kinda depends on the habits of the individual engine.
most engines will burn less oil if you go to thicker grades, but some engines do just the opposite. My working theory is that if the oil control rings are weak, sometimes they "skate" over thick oil instead of scraping it off the way they should. Those engines might burn less thin oil since the rings can scrape it down better.
But frankly a quart every 2-3k miles isn't severe at all. Yes, its a lot for a little 4-banger that normally can go a whole oil change without make-up oil, but its still not what you'd call bad. The other thread where a car needs a quart or two every other fill-up has bad oil consumption.
It depeneds on what is causing the oil burning, Shell did a study and IIRC if it is the rings, upper ring in particular a 20 grade actually was better than a 40 grade for lowering consumption. Goes against what most were told, but it spells it out in the article. If it is bad stem seals and valve guides a HM 10W30 is good, Schaffers #132 added to the oil lowers consumption as well in some instances.
Now the good news, an engine with 250,000 miles on it using a qt of oil every 2000 miles is doing just fine. Car makers consider oil burning for warranty claims as a qt/1000 miles normal. Go figure