hey guys, ive been losing oil lately, but i can't find any leaks. i just check the dipstick every now and then and it keeps getting lower and i have to add more oil. my car also has a tough time starting some mornings. i also noticed some oily substance on my valve cover around the spark plugs. ive had my spark plugs replaced a few months ago and some head gaskets replaced as well around 6 months ago. not sure whats goin on. thanks for the help!