Gearbox oil & noisy syncro

Hi

I read in the Classic Car Weekly GTI feature from a couple of years ago that the classic 'noisy/worn 1st or 2nd gear syncro when cold' can be alleviated by changing the gearbox oil from recommended 80w/90 to 75w/90. Presumably the oil is a bit thinner and therefore takes less time to heat up. Has anyone tried this or have an opinion on this advice?

Cheers

I have refilled with fully synthetic gear oil on one of my earlier Mk1s. It certainly overcame any 2nd gear crunch I had and can thoroughly recommend it!

You will need a large (17mm I think) allen male socket to undo the drain/fill plugs. To fill go in under the wheel arch with a piece of clean flexible tubing. Fill to overflow, drive it a bit, cool down and then fill to overflow again.

Cheers
Rajan

Rajan - can I ask which synth oil you used in the gearbox? Would one of the Redline products fir the bill?

Cheers,

Chris

I can't remember which product it was Chris, was many moons back with my old Campaign. I think most low viscosity synthetic oils should be OK though.

Thanks mate - I'll check the specs on the Redline fully synth - used it in the box and diff on my MX-5 and it really improved the shift, especially when cold.

Chris