Hillbilly
VW don't specify a viscosity rating in their oil specs. It's just pure coincidence that all 504/507 spec oils are 5w-30. It is theoretically possible that a 504/507 spec oil can be 5w-40 (or any other combo of numbers) it's just that nobody has bothered to market it yet.
It's also possible & within warranty guidelines to use 5w-40 502.00 (which is available in several grades) on petrol engines & still retain warranty as VW list this in the owners manual as an acceptable lubricant.
VW don't specify a viscosity rating in their oil specs. It's just pure coincidence that all 504/507 spec oils are 5w-30. It is theoretically possible that a 504/507 spec oil can be 5w-40 (or any other combo of numbers) it's just that nobody has bothered to market it yet.
It's also possible & within warranty guidelines to use 5w-40 502.00 (which is available in several grades) on petrol engines & still retain warranty as VW list this in the owners manual as an acceptable lubricant.

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