Smith and allan, Westway or major brand oil?

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I got a 5L tub of Smith & Allan of DW40 last year and it works splendidly. Have run a couple of our TDIs on their VW504/507 oil and ran sweet as a nut. They sell the 5L VW504/507 on ebay @ £25 and £16.65 at the counter which is a 60 mile round trip for me.

Last year I got 4x5L Mannol 504/507 for £42 on ebay.