In an oil convo/post over on a VW forum I'm active on and this came up....the HTHS of the M1 Euro 5W40 is 3.9 and only 3.6 for 0W40 (not listed on PDS for whatever reason so found it here). Why again is everyone obsessed with the 0W40 vs. the 5W40? Is that 3.6 not accurate?