The use of dual rated (GL4 and GL5) oils in synchronized manual transmissions is controversial and people will argue forever about it.
Personally i wouldn't do it.
Reasons: GL5 diff oils have increased amounts of friction modifiers to ensure slipperiness; these can interfere with synchro function. Also, the old saw about increased EP agents that can damage yellow metal synchros....
All you might notice is notchier shifting.
Charlie
Personally i wouldn't do it.
Reasons: GL5 diff oils have increased amounts of friction modifiers to ensure slipperiness; these can interfere with synchro function. Also, the old saw about increased EP agents that can damage yellow metal synchros....
All you might notice is notchier shifting.
Charlie