AFAIK the 0W vs 5W is the viscosity (flowability) at low temperatures, and the second 30W is the rating for hot oil, so there is no effective difference between the two as far as viscosity goes once the engine is warmed up.
I think the anti-wear additives are the crucial ingredient in 506.01 oils.
The lower cold viscosity in 506.01 might help with cold starts and lubrication at start up with the freezing temps they are getting in Europe and northern USA lately.
My theory on why VW hasn't officially approved 507 for the early R5 motors is simple economics - that particular variant of the R5 engine is no longer made and there are not many of them in use, so not much demand for oils for them, therefore not worth spending the money to go through the approval process for 507 oils.
Do you know if 505.01 is
currently approved for your engine ? I ask because VW have been known to change oil approvals for engines well after the date of after manufacture, thus rendering "no longer accurate" the info in the owner's manual that came with the vehicle.
I have read quite a few oil manufacturer's "which oil" guides for T5s, and I don't recall seeing 505.01 mentioned as suitable for R5s.
Personally, if I had an early R5 engine (I don't), I would be more comfortable using a "made to spec" 507 oil than with a "VW officially approved" 505.01 oil, especially if going the full 12 months/15,000 km between services and/or if there were a significant number of short journeys in the driving regime. Probably wouldn't matter either way with shorter change intervals and wholly longer journeys. But that is just my opinion
As I've said before, it is up to each individual to gather all the relevant info and make the choice they believe is best for their circumstances.
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