my mk2 polo handbook states the 085 box requires GL4 oil, ive just been after some top up and the shop assistant insists gl5 is a suitable top up oil?
is this correct..i need about .5 top up.....and may well drain and refill in the near future
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There's conflicting info on the internet, but I would imagine it's a bit like DOT3 and DOT4 brake fluid. If the car only requires the older spec, either will work. If GL5 seems to be the standard, I'd buy that - make sure the viscosity's right though.
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Actually after a better look on the net, it looks like both are commonly available, and some cars require a GL4 only. If you can find a GL4 oil, it might be better to use that instead of the GL5. Some oils reckon they're compatible with both specs.
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from what i could find on google....gl5 isnt backwards compatible, says something about it can corode brass parts?
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You'd have to ask a VW expert if that is relevant to your car. Otherwise, just use Castrol SMX-S which is expensive, but should be fine.
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Most GL-5's are not suitable for a gearbox specified for GL-4. GL-5's have a high level of EP additive, usually sulphur-based. This is corrosive to yellow metal synchronisers and will damage the synchromesh over time. GL-5's are generally specified for hypoid gears and gearboxes with syncho's designed to take them (e.g. Subaru springs to mind).
For your VW gearbox look out for a 75W-85 GL-4 oil.
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