|Look at TDIParts.com or BoraParts.com for your VW spec oil (505.01). BoraParts also carries the 507 spec oil.|
Your 2009 requires 507 rated oil. The 2003 requires at least 505.00 but can use 505.01. VW came up with it's own rating system years ago, using numbers like 505.00, 502.00, etc. To keep buyers options open, they some of their 50X.XX standards were either equivalent or really darn close to the more common API ratings, like CI-4, CI-4 Plus, etc. There's a good write about it on tdiclub.com if you're intereted.
Which M1 were you running in the 2003? As far as I know, the only Mobil products that met the equivalent standards were Delvac 1 and Truck & Turbo Diesel, both of which are 5w40. Rotella T Synthec
Last time I was at Dana, I bought a bottle of Castrol Professional SLX 504/507 5w30 oil for about $8/liter, which is a very reasonable price.
TDIparts.com sells oil change kits, which include 5 liters of the Castrol 507, an oil filter, and a new drain plug for ~$50 plus shipping. You car only requires 4 liters, but it's good to have the extra liter on hand to top up with as necessary. Peter (the owner of TDIparts) also sells Total Quartz Ineo 5w30 504/507 oil.
Worldimpex.com is another good source for parts.
Modified by OttoSchultz at 9:46 AM 8-14-2009