Hey guys. I've been having oil consumption issues with my '09 Pontiac Vibe 2az fe engine. I know the piston rings are the main culprit, but I was wondering if I could be losing oil some other way as well. I've started checking the oil level before bed, about 2 hours after the car is off. I check it again in the morning and it's always noticeably lower. I've also noticed the spark plugs have a brown stain half an inch up all around the top white insulator part. Any ideas on why this is or how to mitigate oil consumption other than through blowby would be appreciated as always!