It is still a mixed bag! Some parts are metric and some are American. OrAlso alcoholic beverages, and I understand that American cars use metric
nuts& bolts, and have for years.
am I supposed to say Imperial? Anyway a mechanic needs to have both. I
hate that! You think the darn thing looks like a 1/2 inch and it is
actually a 13mm. How the hell can you see a 0.0118 difference of an inch?