my chrysler 2.2L 4cyl has 82,000km on it, and started leaking a bit of oil out the bottom of the car somehwere before winter and i stored it in the winter and placed a large cardboard underneath....after there was some oil on the cardboard.....well anyway come april 20th, i changed the oil and checked for leaks underneath and doesnt seem to be leaking anywhere but i notice small spots of oil underneat...oil pan is is not rusted out....i had a new valve cover gasket put in last year....its not burning oil.....but yet after a while on the dipstick it gets down to the add mark....do i have bypass going through rings....i dont get why its losing oil.....also antifreeze is not in oil....