Why am I going thru so many quarts of oil lately? on 2004 Buick Rainier

2 months ago I had an oil change at jiffy lube and 4/5 weeks later, the low oil pressure light came on. I checked the oil and found none touching the dipstick. After adding 4 quarts, the dipstick read LOW. That was about 3 weeks ago and now we are back in the same situation but this time the check engine light is on and did not turn off when I added oil. I don;t have oil leaking that I am aware of, no smoking anywhere. The only thing different is when my wife told me that a light was on, I noticed the typical ticking that would indicate a low oil level. Vicdog

by in Kenosha, WI on August 23, 2012
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2 answers 2 comments
ANSWER by , August 23, 2012
Has got to be a leak,if eng. was burning that much oil it WOULD be smoking.
ANSWER by , August 23, 2012
how many mile son car
COMMENT by , August 23, 2012
I am at 152K and I had it checked for leaks at the Jiffy Lube to no avail. (no leaks)
COMMENT by , August 23, 2012
poss valve guides or seals