Well, my 3000 mile experiment with Pennzoil 5w20 will be coming to an end very soon, and thanks to the generosity of Johnny, our resident Pennzoil guy, the next 3000 miles will see Pennzoil synthetic 5w20 in my Chrysler. So, we are going to get a direct comparison between these two oils from an engine that is spec'd to run on 10w30. Look at the specs for the regular Penn 5w20 and synthetic. The regular 5w20 beats the syn 5w20 in several important specs, and it's a virtual draw in the others. Molakule or Terry, would you like to offer an opinion as to why the regular 5w20 would have a lower pour point than the all-Group III synthetic 5w20?
code:Conventional 5w20 Synthetic 5w20 Flash Point, °C(°F) 229(445) Not listed Pour Point, °C(°F) -45 -42 Viscosity @ 40°C, cSt 48.0 46.72 @ 100°C, cSt 8.6 8.8 Viscosity Index 158 171 HT/HS 2.65 2.70