In the Pennzoil vs. Torco, they show that Torco makes more power by comparing Pennzoil 10W-30 dino to 5W-30 Torco synthetic. What BS. Why not keep the visocsity the same and make it a real test? Even with the visocity change, the difference in hp was so minor that it could be attributed to test repeatabilty problems and instrument precision (we are talking less that 1%). I hate when marketing types present data like this.