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I'm using the Castrol 75w90 Transaxle GL4 for the m66 AWD and the Castrol 75w90 GL5 in my angle gear.

In the 2002 C70T5 I'm using Motul 75w90 Gl4

Both are excellent oils.

A GL5 oil is slippier than a GL4 oil.

Too slippy oils are bad for synchronisation in manual Transmissions.
 
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