Terrible advise. This is Relic "knowledge" from the 70's, and needs to die.
Factory recommendation is 5w20, the 5 is winter viscosity and 20 is warm temp. These oils lose viscosity the colder they get so going to a 0 is exactly the wrong decision. You do not need to play with this, going to a 0 cold viscosity is going to put unnecessary wear on bearings, especially when your talking about someone who is starting their truck "10-20 times per day". Its also a good way to lower oil pressure in a system that's already heavily taxed. Going to a 30 hot viscosity will do nothing but put extra strain on the oil pump and reduce fuel economy.
You
do not know better than the ford engineers who set the engine clearances and specified the bearings and oil weight, and whom actually have an understanding of the chemistry of modern oils.
Last edited: Today at 10:51 AM
2011 Molten Orange Raptor 6.2l
2006 Mustang GT Whipplecharged
1978 F150, 460 + S480
1955 M38A1, 351W
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CanadianRaptorVL likes this
Hey Ben
Is a 5 weight oil the same at -40 as it is at +40 ? It pours entirely different. So what is wrong with a 0 weight oil that flows at -40, rather than being like corn syrup? Getting oil to bearings is a priority. Lots of engines have factory speced a 0 weight oil for 365. Why not go to a 0 for winter and a 5 for summer if you want. Please explain. Engineers built the Titanic to be unsinkable and it didn't even make the first trip.