The vw 502 rating is basically an indiactor that it has a HTHS viscosity of 3.5. The M1 5w-40 is a heaver duty oil than the M1 0w-40 or Syntec 5w-40.
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BC lacks VW LL 503.01 spec and was formulated in 1998 with a magnesium-based additive package to meet the VW502/A3 spec. Nothing special in my book. I am a Castrol fan, but would prefer Delvac-1 or even Rotella Synth.
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No 5W40 with the VW 503.01 out there man.
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Is 503.01 the most stringent test?
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I e-mail VAG in Germany about the 502 50301 deal. They didnt go into detail and how the testing procedures are done, but basically stated that 502 00 = Cars on fixed oil intervals
503 01= Cars with Long Life intervals (the Europeans get the oil meter that tells you when to change oil)
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The Europeans sure like to stretch out those OCI's.