Vehicle: Saturn Vue with the Honda 3.5L V6. Ran M1 in the previous fill for 3K, then put Supertech "full" synth 5w-30 this past week. I figure that running 3K OCI's for the first 20K or so is wasting money using M1, so I gave ST a shot. I was surprised at how the temp needle is on the low side of 3/8 temp. M1 ran just below 1/2 temp. Big difference, th only change is the oil. VERY surprising to me. This week's past cold weather and even with it warming up, it still doesn't run as warm compared to M1. Any hints as to why?