Service at 135k miles?

Just wondering what I ought to get serviced/done on my 1996 300tdi 110 now its at 135k miles?

Ive always changed engine oil, oil filter & air filter every 6 months and I recently changed the diff oil. Its soon going to my mechanic for the following

Cambelt
water pump
aux belt
fuel filter
coolant fluid
Gear box oil

Anything else worth doing whilst the mechanic has it?

tappets

Depending on old it is oil gasket rubber jobber whilst you're doing the tappets, oil engine breather and maybe thermostat whilst you're draining the coolant

Aux belt tensioner as if its not squealing yet it soon will be.
The syn gearbox oil from diff lock transformed the 380 in my td5.

jamesmartin said:

tappets

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Get into the modern world man, it's valve clearances now don't you know.

It's all stuff that you can easily do yourself. Allow yourself a full day and dig in. It's fun and satisfying.