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Posted to Castrol Forum on 11/2/2020 1 Reply

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5W-30 is two separate ratings. SAE 5W and SAE 30.

The same applies to 5W-40.

Both 5W-30 and 5W-40 pass the same 5W tests. [SAE J300 2015 revision]

VW has stricter requirements than SAE for High... Login to read more.

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