Rotella is known throughout the engine industry for being one of the best, period. That said however, always make sure the product is right for your engine, I did not really examine it because I choose to use a different oil....but you're right, under 5 per gal is a great price for Syn!
Just looking at the bottle, I'd think you're good to go mostly b/c Rotella won't play the bait-game as crappy manufacturers sometimes do.
jeff