I was lazy 3 months ago and had my oil changed at an EZLube. While there, the tech pointed out that my differential fluid needed changed. It was $50 or so, and at the time he gave me some rationale why it was a good idea. (don't remember that rationale now)

However, after reading several posts, it sounds like refreshing this fluid on an almost 25 year old car is a good idea. The problem is, about 3 weeks after the change, I have started noticing whining during deceleration. I believe it is there on accel also, but masked by engine noise.

My friend who is a car guy (rebuilt his Cleveland small block on his late 60's stang) and a cynic said they probably forgot to replace the fluid.

My 380SL has been parked for 2 weeks while I do a timing chain replacement and some other repairs. Before I drive her again, i'd like to verify that there is fluid. Is there anyway for me to check this without draining it?

Thanks,
Justin

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Justin Ford
'84 380SL
'05 Jeep Grand Cherokee