As far back as the mid 1970's VW handbooks were stating to owners that the 'Oil is not changed' in
regard to the gearbox/diff.
That advice was highly dubious back then and despite great advances in lubrication it still is, especially
when you consider the big increases in power and torque these days and the stresses that brings with it.
If you rag your car and it's gearbox, get the gearbox/diff oil and any filter changed well before 4 years/40K
miles. If you are gentle as anything, then you could leave it until 60K-70K miles and very likely get away with
it - but if you like your car you will be having it done at 5 years/50K miles no matter how kindly it's driven.
regard to the gearbox/diff.
That advice was highly dubious back then and despite great advances in lubrication it still is, especially
when you consider the big increases in power and torque these days and the stresses that brings with it.
If you rag your car and it's gearbox, get the gearbox/diff oil and any filter changed well before 4 years/40K
miles. If you are gentle as anything, then you could leave it until 60K-70K miles and very likely get away with
it - but if you like your car you will be having it done at 5 years/50K miles no matter how kindly it's driven.
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