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E34 (1989 - 1995)

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Old 08-11-2014, 09:54 AM
wilourosen wilourosen is offline
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Location: NYC
 
Join Date: Aug 2014
Posts: 5
Mein Auto: E34 535i Manual
M30...Best gear oil

Hey guys, i currently have 75w90 gear oil in my m30 engine 1989 535i manual, i read somewhere on the forum that thicker gear oil is better especially for old cars (176k on mine). Someone said that Royal Purple Synchromax is very good, and they have 75w140 and a 85w140. Im wondering which one would be best.
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