Last winter I used M1 0w30 with a Fl820s filter in a 99 E-150 van with a 5.4 engine, 250,000 on the clock. Very nice combo, 98% quiet start-up noise. This summer I decided to try to improve on the start-up noise so I decided to use M1 HM 5w30 with a Fl820s racing filter. Really nice combo, 99.8% quiet start-up noise. So for this winter I was thinking about using half M1 0w30 and the other M1 HM 5w30. What do you guys think? Best of both worlds or snake oil? My engine is specked for 5w30 on the oil filler cap as well as the owners manual.