Yes pbm, this was my second 15K stretch. I pushed SuperTech 5w-30 Synthetic for 15K and Blackstone recommended I could try it to 17k! When the engine had Supertech in it, I replaced the valve cover gasket and used a good amount of RTV around the spark plug channel gaskets and the spark plug valley gasket as well as several junctions where the factory specifies its use. These are infamous for filling the spark plug channels and valley up! Not enough tension in the center of the cover apparently ! That is why the silicone was high on the last UOA. Even after repairing the gasket, the Duratec seemed to use oil, but not as much as my wife's Ford designed, Mazda built 3.7 V6. I bought this car to commute to work and it was used with 100K miles on it. Decided I'd experiment with oil for my entertainment as well as everyone else's. My first UOA showed that SuperTech is a great oil. The second showed that T5 is a great oil. I'm sure the next UOA will show that T6 is a great oil. I was planning on using a 5W-40 next go around. Probably Delo but will go with whichever has best promotion. I can't say for certain that the thicker oil burns off less because I don't know how much of the 5W-30 was getting pumped into the spark plug channels. I used a Ph3600 sized,double the capacity, oil filter. It was a Wix closeout from Rock Auto.