Mobil 1 is a full Synthetic. The Motorcraft Oil the factory uses is a Synthetic blend.

Motorcraft does offer a full synthetic but I do not believe that is what the factory puts in these cars.

Mobil 1 is a Base 3 POA which is not a full synthetic oil. Anything at a POA 4-5 is a fully synthetic motor oil. Mobil is advertised as full synthetic due to its great ability to protect against wear. I read an article in DSport magazine that I still have at home, that did a HUGE detailed review on motor oil in general. I typed out the entire article over on Corvetteforum. I will copy it here in a new thread. Stay tuned :)

-Alex

Here's a link.

http://dfw50s.com/showthread.php?p=35464#post35464

The term 'full synthetic' has become a misnomer since there is no universally accepted definition. It's now become a throw-around term for oil made with Group III, IV, or V base.

Back from the dead but here's my 8200 mile Royal Purple 5w-30 analysis
http://i907.photobucket.com/albums/a...ps9e60ce14.png

I use Mobil-1 5w20

Pennzoil Synthetic Blend 5w30 in our truck.

Both PER Ford specs.

Pennzoil ultra. Hard to beat.

Thanks for the update.

-Alex

Yep, multiple test have shown Pennzoil Ultra to basically be the top "of the shelf oil" you can buy. It beats Royal purple and Mobile 1 extended. Still can't hang with Amsoil, but its not on shelves.

Okay. Here's the results of the analysis I just had done on my oil. Blackstone recommended trying 9,000 miles next time and that's on Mototcraft syn blend. Fine by me.

Looks like that's about the limit.

I switched to Motorcraft 5W30 when I did this oil change. I may or may not do another UOA when I have it changed according to the oil life monitor. Since Don Davis Ford does a change with filter for $32, I can live with the findings. :happy107:

My current oil change is going to be my last time running the Motorcraft Synth blend 5W-20. I plan to do a UOA and see how the car has done on this oil for 42k miles, then the Amsoil 5W-20 full synth goes in.

Very interesting in seeing results.