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Yes
if at all possible you need to use anti freeze but water is ok to use in a pinch
You can use any air filter as long as it is designed for vehicle.
You can use regular antefreeze just delute it 50/50 .and make sure its ok for aluminum .
if coolant is ok!! then check coolant sensor.
ok
Absolutely not! The sophisticated BMW engine requires premium fuel ONLY!
ok
yes the red atf fluid is ok for your power steering, and only power steering, do not use regular atf fluid in the actual trans.
Have the coolant changed immediately and you will be ok.
The colors are irrelevant, just use any 50/50 mix & you will be ok.
As long as it does not "ping" excessively