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[timsev]

Can someone with OEM 18's let me know what the recommended pressures are in the door jamb please?

I've got an E92 that came with Comp 19's, but I put 18's on and the label doesn't list any pressures for 18's and it's not in the owner's manual. Thanks!!

[mlhj83]

The pressures are the same as your 19s as long as the tyres on the 18s are 245/40/18 and 265/40/18. It is for mine according to the placard. Pressures are specific to your car due to options etc., so follow what it says for your 19s.

[gatorfast]

^not true. Pressure for the 18s should be 33/35 f/r. It's in the owners manual (gives recommended pressure for both 18s and 19s).

[mlhj83]

Originally Posted by gatorfast

^not true. Pressure for the 18s should be 33/35 f/r. It's in the owners manual (gives recommended pressure for both 18s and 19s).

I beg to differ, unless the owner's manual is specific to your M3 and not an arbitrary value. Our manual in the UK does not list pressures and specifically states to follow the values on the vehicle placard. Here is mine (which has ZCP):

It clearly shows that the 245/40/18 265/40/18 are to be inflated to the same values as the 19s (not for a fully loaded car however).

[gatorfast]

I guess it is different across countries then. Here is an excerpt straight from the M3 manual downloadable on bmwusa.com: