Just a point someone mentioned to me once? When a 80w/90 spec oil is specified why can`t a 75w/90 oil be used as it covers the 80w range as well? And will save you getting another grade of oil?:scratching_chin:

It will possibly be slightly too thin at certain temperatures.

Having said that - fresh oil of marginally the wrong grade is almost certainly going to be better for the car than the old oil that is in there already.
 
I contacted my local Landrover dealer and they told me they don't actually stock Texaco manual gearbox oil and and make of the same speck is fine
 

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