Over the last few years, I've been using up my stash of free after rebate 5w30 in a vehicle that specs 5w20. I finally got to use my free after FRN PP 5w20 and what a difference! Start up is easier and I especially noticed this on the first start up after the oil change. The engine seems lighter during warm up and acceleration is improved. The biggest thing I noticed was the lack of noise intruding into the cabin at and above 80mph. Previously that was the point where it became a little too noisy to easily have a conversation but now it is little different to the noise at the 70mph-80mph range.