Every two Months I loose 1.65 qts of oil but none to the ground. WHY? on 2002 Chevrolet Astro

I get my oil changed every 3 mo. I am loosing oil but nothing on the ground. What are the possibilities that it could be? I have 117,000 miles and the van is in otherwise great condition.

by in Saginaw, MI on October 26, 2012
4 answers
ANSWER by , October 26, 2012
i would bring it to a shop that perform test to find out your oil leak and maybe compression test also.
ANSWER by , October 26, 2012
any smoke from the exhaust? is the air filter oily?
ANSWER by , November 07, 2012
Valve cover gasket(s) or other , leaking onto exhaust and burning off before it hits the ground? Any smoke on first start-up? How many miles in 3 mos.? Proper viscosity oil being used?
ANSWER by , February 05, 2015
How many miles are you driving in those two months? The oil is probably being burned by the engine. This is normal. You add oil as necessary.