Shell spirax
Submitted: Friday, Jul 01, 2011 at 10:59
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Lawrence
Hi fellows. I recently did a gearbox swap with a new clutch. The gearbox oil, that i put in was Shell Spirax A. i now find gear changes to be notchy (gq patrol). I have recently discovered that the appropriate oil would have been the Spirax G. Would this have made a difference?
Reply By: Member - Ed C (QLD) - Friday, Jul 01, 2011 at 13:36
Friday, Jul 01, 2011 at 13:36
Two issues here, weight (viscosity), and API rating (GL4 / GL5)...
Nissan recommend 75W-90 API GL4
It is generally accepted that GL5 oil should NOT be used where GL4 is specified.. something to do with the extra sulphur in the additive package eating the yellow metals (brass/bronze) used in the synchros...
On that basis alone, the Spirax A (GL5) is incorrect, and I wouldn't be leaving it in there long term...
On the issue of viscosity, I've found that the 75W- bit to be the key in eliminating (or at least greatly minimising) that annoying "cold shift baulk" ..
The Spirax G is the correct GL4 rating, but there doesn't appear to be a 75W-90...
The 80W-90 would be fine once warmed up, but possibly/probably a bit notchy when cold....
Regards, Ed C
:)
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