Hi All.

This is my first post here.

I drive an Astra 1.7TD with the Isuzu motor in it. Not high performance by anyones standard I know but I need it for the high mileage I drive. The car has done 140,000 and currently covers 1,300 per week.
Can you please tell me how exactly to change the gearbox oil and which oil you would recommend for a high mileage engine like this please.

Kind regards to all of you.