2002 2.5L Forester, SOHC w/ 187k. Just had new head gasket and timing belt 3k ago. Using 1 quart oil/ 300 miles. Noticed immediately after head gasket and timing belt change. No external leaks, no oil into coolant. No noticeable smoking or burning oil smell. Engine performance seems normal; MPGs about normal 26 on hwy and seems to have power climbing. I do have a bad catalytic converter but upstream O2 sensor is new and no codes for it but do have a code for the downstream one.
Did not have problem before head gasket replacement. Added Seafoam into crankcase and changed oil and filter after 200 miles.
Did compression test
Cylinder 1 Dry: 160;Wet: 175
Cylinder 2 Dry: 165;Wet: 180
Cylinder 3 Dry: 160;Wet: 180
Cylinder 4 Dry: 160;Wet: 170
Also did a vacuum test and was within normal range on the low end.
Any ideas on to where and how I'm losing the oil?
Any suggestions if changing to a different weight oil would help....using conventional 10w-40?
Edited by wildseamus, 19 October 2013 - 12:17 PM.