On my '87 I added regular blue ww fluid. My ww fluid level indicator float would sink in the blue fluid, and leave the low fluid light on all the time. I bought the $3 tube of mercedes mix and mixed it with water, the level indicator float would now work. I tried this with the float removed in 2 buckets to be sure. It may be my float is old and not as bouyant as it should be.

Chuck