When we worked at the 10 minute oil change, we would chase the threads in the oil pan with a tap, then use the GM 1/2" drain plug and nylon gasket for it...
It's stronger than the original drain plug with the 7/8" hex head and will last longer...
I`d check the threads first, to verify their condition. when my daughter was driving my 88 Silverado going to school, she had the oil changed at jiffy lube in Owasso ,ok , all the time she had it. When I GOT THE TRUCK BACK, THERE WAS A RUBBER EXPANDABLE PLUG TYPE DEAL IN THE DRAIN HOLE, REALLY A PIECE OF CRAP. I JACKED THE TRUCK UP A LITTLE SIDE WAYS WHERE THE OIL DRAIN HOLE WAS ABSOLUTLY THE LOWEST POINT IN THE PAN, AND TORE THE RIG OUT, AND TAPPED THE HOLE W/ A PIPE TAP. THEN POURED FILTERED USED OIL BACK THRU IT TO MAKE SURE IT WAS FLUSHED GOOD. no problems with it from there on. I don`t feel bad at all about bad mouthing shoddy work ! (sorry about the caps, clumsy typing here) Hopefully the jiffy lube has changed empoyees since then.
