hey guys, how you change the spark plugs in a 525i?

[Dave M]

I know that all M50 are COP, but not all 91 are M50.

I've got a 10/90 build date M50 525im. Check realoem or the ETK and try the pre-91 build dates (U.S. vehicle). At some point before 91, the M50 became available. Were they both (M20 and M50 build in the same year?)

Dave M

[Jon K]

Here in the states I think the '91 525 is the old M20 2.5. Not familiar with the acronym COP.
Tom

The 91 cars seemed to switch in the late year to the M50, so some say. I personally have not seen a 91 model year with an M50. Mine is a 9.91 production car... but a 92 year model.

[sirius_GTO]

Thanks A Bunch Everyone For Helping!!