After a trip to the dealer (My Vette club has a deal there) for an LOF, I was surprised to see the synthetic oil listed as 0-20W...I didn't really notice until I jumped on the Freeway and nailed it...it felt a good bit quicker, but we know how that goes....so I just kept notes to myself for awhile....the mileage seemed better and it did indeed feel quicker. At about 3500 mi after the LOF I checked the oil to see if it was staying clean and whoops, it was down 1/2 Qt, but very clean, so I got another Qt of Mobil 1 and added 1/2....I took it in @ 5000+ and it was down 1/2 again ,but clean so I told them to do it again just like before.
When I looked at the bill at home, it had been filled with 5W DEXOS oil...cheaper, but what the hell.....will be calling asap to find out why....
Any users of Mobil 1 0-20W out there????