I`ve asked this question I don`t know how many times and still don`t know which oil to use. I`ve an 03 130tdi in the service book it states to use 505 01 so I changed the oil and used Castrol Edge 5w-40. And since the oil change it rattles like a bastard on start up which it never used to do. So i`m thinking its the wrong grade of oil. Don`t know if its relivant but the car is classed as an import and isn`t on the vw database so they`re unable to help as well
Mine is an 02 TDI 130 and also uses 505.01 oil with no problems - I don't think that fact that its an import would have any effect on the type of oil as its the same engine. I had the problem of rattling tappets on a BMW, it started off with a rattle only on start up but after an oil change got worse. I used an engine flush then another oil change and it was worse than ever. Ended up replacing the tappets to gain piece and quiet! That was on a car with full BMW history and about 75,000 miles.
If you only get the rattle on start up for a few seconds, don't worry about it, many cars do this.
Another point on the oil as made above, Halfords do sell the Castrol stuff but only in 4 litre containers - you need 4.5 litres for an oil change so you either have to buy 2 4.5 litre tubs (expensive) or an overpriced 1 litre top up bottle.
Main dealer stuff is £37 for 5 litres.