GT TDi 130 '51 - General Advice please

Hello, im re posting having found this forum excellent for any past queries to a new VW driver and general mechanical novice, so thank you.........:biglaugh:

so my questions...

Having had trouble with my Fuel injector - which turned out to be the wiring harness (much much cheaper).... thank you people

What is the correct engine oil to use for my model 130PD (chipped to 180) ? apologies if this is covered in other threads as possibly using the wrong oil may have affected my wiring harness ? perhaps not to mention my engine, I am currently using castrol gtx which says is suitable for VW 505 range, not sure what mine is though!

Additionally i am coming up for 52000 miles, what is the correct time to get my cam belt changed? any other likely areas which may need attention for a vehicle of this age/mileage?

The cars has FSH and has been maintained very well, so im looking to carry this on,

i am very pleased with the car in general just wanted to iron out a few queries

Thanks for you time

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I am currently using castrol gtx which says is suitable for VW 505 range, not sure what mine is though!

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You must use 505-01 oil for 10k service intervals.

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Additionally i am coming up for 52000 miles, what is the correct time to get my cam belt changed?

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Change the belt at 60K