82 MB 300CD - 167k. Has sat in my garage since around 2012 due to life (kids). Started up right away, but have encountered a few issues. One is that 40-50 mph only, and only when on light throttle, I get a slight whine from the rear of the car. Let off the throttle at those speeds and it goes away. Press hard at those speeds, it goes away. Keep light throttle at >50mph and it goes away, ditto <40. So it's a very narrow band, and only with light throttle. First investigation was if perhaps it was low on oil. Zero leaks where it was parked, but wanted to see. Fluid (Mobil 1 as I recall, from 2010 timeframe) came out with a lot of entrained dark dirt. Hold it up to the sun and it was metallic. Note in the pics none of the large chunks were from this job (I didn't clean my drain pan well and it had a bit of grease and paper from a prior project). There was no metal shavings or metallic particulates in there. Any solids were sand and other grit in the drain pan. It could have been lots of cleaning. The M1 in there was the first drain and refill since I took ownership, and who knows the service status before that. I can't really see in without removing the cover. I learned of Mobil1 diff lube from this thread back in 2001: http://www.peachparts.com/shopforum...
I've seen some dirty fluid, some with moisture in it, etc. but I'm a bit surprised by the metallic nature here.
You can see in the funnel how the fluid is clear and just suspending this mess. Thoughts on the combo of this and the whine?
Put AMSOIL SVG in there, TBD if it's in useable shape, but a drain and refill is easy enough.