Originally Posted by Cito Pelon
Below-zero starts for one thing, Minnesota dude. You will certainly notice the engine cranks over easier, synth oil circulates much faster, gets up to the valve train much faster. Synth just does not thicken up in super-cold weather like dino.
Also, it's been proven absolutely you'll get apx. 2-3% HP increase with synth. That's kind of a big deal.
When it's 40 below, I think it's gonna rattle for a minute no matter what, but you may have a point. Your whole car is over an 1/8 inch shorter in the dead of winter as opposed to summer. There are gaps between your motor's parts until it warms up.
I'm gonna need a new car sooner than later. Might have to try syn this winter in the new one. If it works, it will easily be noticeable. You wouldn't believe the sounds your car makes when it's really cold.