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Colour of Oil

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McCabe-Thiele (Ted):
It could just be a batch difference during manufacturing or even a slight change in specification - might be worth contacting their technical department if it's worrying you.

When I changed the rear diff  oil in my W124 300TE 4-matic Estate the old oil came out looking like back treacle - I remember vividly it as the smell was just awful.

Bryanj:
The oil drained from Leyland coach torque convertes always smelt like rancid gnats piss

K2-K6:
I'm with Ted on the cause likely being just a little oxidation as difference between the two sample.

Doubt if it has any real effect as the service life of GL5 spec could easily be 100,000 miles in a plain differential, there's no other outside influences to contaminants.

Think that GL5 spec increased the sulphur content as it gives friction/longevity benefits to gear sets in service. Probably enough sulphur to preserve a horse  :) and why EP oils have that predominant pong even when new.

Johnny4428:

--- Quote from: Bryanj on July 10, 2023, 09:53:31 AM ---The oil drained from Leyland coach torque convertes always smelt like rancid gnats piss

--- End quote ---
😂😂😂
Going to take a lot of gnats to make any quantity!

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