Advice with T1000 needed

Hi guys new owner of a T1000, c reg (1985) 1.6 5 speed camper front wheel drive.
Only done 55,000 full service history and relatively rust free.

http://ift.tt/1PHdneW

I need some help and info please.
1. The 2 sumps in the gearbox what is the best oil to use in each?
2. Best engine oil to use?
3. Mine crunches in 3rd sometimes, but mainly in reverse gear. What could cause this? Low oil?
4. Would changing the colour from beige to a modern colour decrease it's valve? (Not really sure what there worth anyway).

Thanks for any help you lot can give.

Currently in dbutch90's garage:
First time owner of a Renault Trafic t1000 camper

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Advice with T1000 needed