Thats what I figured. the guy @ Fumoto was saying that its a 1/2" x 20. I ordered the 1/2" x 20. The guy @ Dodge might be wrong. I've asked around also & I've gotten 1/2" x 20 & 14mm x 1.5. I guess I'll order the 14mm x 1.5 also. Thanks. I'll post which one when I do oil change.Its the 14mmx1.5. I called to verify it with the dealer, because I bought a fumoto drain valve for the 4.0.