M5 warm up question

["Ryan Kundrat" <ryankundrat@xxxxxxxxxxx>]

Being a Z3 owner, I have a question regarding the "warm up lights" on the M5 
tach.  Is that a measure of coolant temperature, oil temperature or some 
other other engine temperature?  Does it rise (lights go out) according to 
the engine temp guage, or does it work seperately?  I guess what I'm trying 
to find out is when my Z3 temp guage reaches the normal operating level, can 
I rev it, or are there other engine components (or oil) that take more time 
to warm up.  Thanks.

- -Ryan
'01 Z3 2.5i

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