In article ,
Robatoy wrote:
....snipped...
I personally witnessed:
Run the engine up to temperature on a wheel-driven dyno take a sample
and print.
Without delay, change to synthetic.
Run the engine up to temperature on same dyno, half hour later, sample
and print.
...snipped...
133 HP to 137 HP.
I doubt it would show up on the quarter mile time, but hey, I was
surprised.


There may well be something to that, but it would not be unusual to
have a 4hp variation between runs even if NOTHING changed.





--
Better to be stuck up in a tree than tied to one.

Larry Wasserman - Baltimore Maryland - lwasserm(a)sdf. lonestar.org