If the oil is both VW 507.00 and 504.00 then it is OK for both TDIs and petrol motors.
507.00 is for TDIs, 504.00 is for petrol. IIRC Castrol SLX III is approved for both ratings.
It is very important to run the correct oil in VW motors, your owner's manual will tell you what grade is needed. Check for the VW rating on the oil container, and never believe anyone (including VW dealers) when they say "this XXX oil is even better than the VW approved oil", if it isn't clearly printed on the label as "VW 507.00" (or whatever is right for your engine) buy something that is.
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