Quote:
Originally Posted by throne7
I am wondering too if synthetic will reduce the gear noise
in my W124 (87 260E). I was told by the mechanic that the
noise from the back when I drive is from the differential
which he says has been quite worn out. However he says you
can still drive it for years without any problems. However
the noise bother me sometimes. I wonder if I switch over
to something synthetic it would reduce it. If it does the
I think its worth teh money.
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If your differential is indeed worn out, no lubricant in the world will make it quieter for very long. Synthetic lubricants are designed to have similar viscosity to their dino counterparts, but have a stronger molecular chain that stands up to high temperature better. Thus, they do not address gear noise. You will get a slightly quieter ride *IF* you haven't changed the fluid for a long, long time. But worn out is worn out - only a rebuild will make it better.