I have a 2002 Subaru Outback. According to the mechanic, it is a leaking head gasket and will cost about $1500 to repair. The car already has 167,000 on it. I just don’t have the money for the repair. Is there any sort of sealant that could be added to the oil to help with this issue? I’m not exactly “mechanically inclined” - but I think I can handle adding something to the oil. I just don’t know what product to use. I’d like to try to get it to last for a few more months, until I can be in a position to by myself another car.