Oil Drain Plug Size

[Strokin37]

I've got an '05 6.0. Two oil changes ago messed the threads up on the drain plug. I purchased a new plug and replaced the damaged one. Went right in and tightened up. Changed the oil earlier today and the new replacement plug went right back in but would not snug up at all, just spins. It is too tight to turn by hand but with a wrench I can turn it. Figuring the pan is stripped, I went to the part house to get an oversized plug. They told me I needed an oversized M14 1.25 plug. I can't seem to find that size plug. Is this correct or do I need to get the M14 1.50......that seems to be the only one I can find oversized. Any input is greatly appreciated, I have about a 900 mile trip in the near future.

[F250SixOH]

Just a suggestion but it might be wise to invest in a fumoto drain valve like many others have. No more stripped oil pans ever As far as your situation right now I think you are on the right path with the oversized bolt if you did indeed strip out the threads on the oil pan.

[twoicebergs]

The normal size is 14mm - 1.25mm. Oversized would be 15 or 16mm-1.25. Since it is stripped or partially stripped already, you should not need to drill for 15mm, just tap. If you don't have metric readily available you could do 5/8" fine thread; you might have to drill first as it is just under 16mm. Don't over torque!

The 1.5mm-2mm pitch is the equivalent of standard SAE thread. Using a 14mmx1.5 would certainly rip out the remaining threads.

[sinner6.0L]

be careful with fine tap threads, they're much more prone to getting stripped out again