I'm due to change out coolant. I've read threads stating that your engine will get better cooling running "water wetter" and higher ratio or water to coolant,ie, 60/40.

The mgr at Jiffy Lube says the opposite is true---they say to run their premier mix of 80/20, coolant/ water, for optimal cooling. Says high ratio of water will just boil quicker.

What should I do?

'99 Trooper, ARBs, 4.77s, ARB bullbar, Warn M8000 w/Amsteel, OME 912s w/2.5" spacers, Rancho 9000xs, K&N/Magnaflow, 33" Kumho MT's, Aisins, boulder bars, Indy 4X brake lines, diff drop, Flexalite