what gearbox oil is best for my 'R'?? semi or fully synthetic?? does the diff/transfer box use same oil as gearbox if not which type shall i put in there??
i put 4 litres of castrol syntrax in mine last week and gear changes are a lot smoother thats in a quaife box tho,i know its one of the best ive used 75/90 gl4 not sure what is best for standard box, if thats what you have?
id still try the syntrax,
or halfords own part synthetic 75/90 that has a gl5 which is slightly better than the syntrax.
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