Oil and Air Con (Two subjects)

Heads up: Homebase has some Castrol Edge at half price in their sale (in the Exeter store) £8 something. I just bought a litre and then realised it's 5-40 rather than the 5-30 I'd bought previously. Is this usable for the 1.4 Tdi?

Second - I'm very tempted to get a second hand pump for the a/c off ebay. Does anyone have any clue as to how much they cost to fit at a local garage (rough idea?).

Thanks for all the previous advice on these forums.
 
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