I've been reading a bunch of posts today and I started to think... I saw many posts about syn only being needed if you're in a VERY cold area or run extended OCI. Makes sense. I run M1 in my car below because VW, as much as I love them, has these pretty strict specs which seem a bit much. This is especially the case in my car, which is NA 2.5L five cylinder with a 6.3 qt sump. So, I guess my question is this...If you're running, say, 5k OCI in a car that is easy on oil, as long as the oil meets the HTHS and viscosity specs, couldnt it be run, even in a car that is spec'd for syn by the manf? I'm not really looking to do this in my car, at least not for a while, but it just came to me. Maybe a stupid question, but there are several great syn blends out there that would, for example, meet the viscosity and HTHS for my car. Just wonder if some of the automakers are covering their butts due to the mostly uneducated and not maint. minded customers. Any thoughts are great.