It is general question my friend and it is not related to my "light on" case as there is a code stored regarding some sort of error in steering angle sensor. The error is mostly electrical not mechanical. And yes, the oil service place topped my steering fluid. I have alerted him to use the right type of fluid & he said don't worry this is the right one. I think he use the same fluid for all cars he services. When both brake & 4x4 lamps turns red, the brake oil level can be low. tc

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X5 3.0i SUV
2005 -113000 miles
GM-A5S 690R Tranny