Oil Drain Plug Size Chart: How to Measure It?
In order to measure the diameterm, you should use a digital caliper or a ruler (not recommended). Measure the width of the plug at the widest part of the threads as indicated in the picture. If your oil drain plug measures 12mm, then you need to look at plugs in the size range of M12* 1.25 to M12*1.75’’. The “M12” refers to the diameter you measure from the widest part of the threads on your OEM sump plug.












