The oil light on my 2002 wrx came on. I changed oil and only 2 quarts drained out. I had to put in 4 quarts.
There is no oil dripping on my garage floor. Where did the oil go? There is no other noticeable symtom (no loss of power, no strange noise...)
My guess is either the oil is burned in the engine (piston leak), or went into the cooling system. I haven't open the radiator cap to look at the coolant yet. Are there other possibilities?
If I don't find oil in the coolant, should I get a piston leak down test? And how much would it cost to fix the piston rings?