Went to change my oil last night, undoing the drain bolt and bits of thread come out with it!...so i get my pinky in the drain hole and i pull almost the entire thread out, only the last few threads remaining. I've been doing my oil changes for the past 4 yrs, last time it was done my a mech due to major service who said the drain plug washer needs replacing to justify the slow (1 drop a day) leak. I searched this and found it could be the problem so i got a new drain bolt/washer ready for this oil change. Anyway ended up replacing the oil, this morning there was a drop on the ground. Anyone had this problem? Did you re-thread the pan or purchase a new one? or did you chase it up with the mech?