[jwtillema]

I seem to recall that synthetics provide a 1-2% increase in power. If you put it in the engine, trans, and diff, that would be between 8 and 15 hp. So those findings don't surprise me.

 

[jwtillema]

I got a '06 crew cab se with about 400 miles on it so far. I was thinking of switching to synthetic oil. Some say to switch after break in and some did it earlier. I drive my truck about 5 miles round trip to work and back home. When should you change to synthetic oil? Also is is bad to switch back to dino oil later on?

My feeling is to change to synthetics after two oil changes.