1. I KNOW cars almost never suffer from oil problems if the oil does not run low or out.
2. I KNOW that the oil spec'd for my car is good for all driving conditions, I don't need fancy/different oils, even if i am doing a alot of highway driving...etc...
3. I know oils last longer in service than we even think they should here - almost all oils will go 6-7k miles safetly, not just 5k.
1. I DO NOT know if we will have SN-spec oils that are 100% dino - they may all have to be syn-blends.
2. I DO NOT know if someday soon, engine oil will become like a lot of ATF fills - for life.
3. I DO NOT know if someday soon, DIY oil changing will be outlawed in the name of 'environmental protection'...I feel it may be.