Oil viscosity change for a 5.7 Hemi?

[Williy]

Many Many moons ago when I lived in Wisconsin even when
the; temps went -35F I used 10W30 reg oil in all my vehicles
year round and never had any problem starting in the cold
mornings.

synthetic oil generally sticks to engine components better than conventional oil when the engine is off, offering superior engine protection. This is due to the superior film strength and stability of synthetic oil, meaning a greater amount of oil remains on the engine parts after the engine is shut down. This helps to reduce wear and tear on the engine during startup, when most wear occurs

willy

 

[kozal01]

Many Many moons ago when I lived in Wisconsin even when
the; temps went -35F I used 10W30 reg oil in all my vehicles
year round and never had any problem starting in the cold
mornings.

synthetic oil generally sticks to engine components better than conventional oil when the engine is off, offering superior engine protection. This is due to the superior film strength and stability of synthetic oil, meaning a greater amount of oil remains on the engine parts after the engine is shut down. This helps to reduce wear and tear on the engine during startup, when most wear occurs

willy

Back in those days engines were much different. The clearances were not as tight and the valvetrains didn't rely as heavily on proper immediate oil pressure to function like modern variable valve timing, overhead cams, chain tensioners ect. Not to mention the need for modern turbo engines to have the correct weight oil for proper oil flow. Oil quality, weight and maintenance is easily the top contributor to modern engines lasting or not.

 

[Too many Kubotas]

If worried about oil on bearings and such, a '19 should have the option of holding the gas pedal to the floor during the normal starting procedure.

Doing that cuts the fuel off, so the engine turns but doesn't start. I give all our FCA/Stellantis vehicles a few seconds of letting the engine build pressure before starting them.

 

[Midniteoyl]

The recall of the GM engine and the 'warranty' fix of going with a heavier weight oil got me thinking. I've got a '19 Ram 1500 with the 5.7 Hemi, 90K on it now and it calls for 5W-20 oil which I've always used. Seems as if one of the problems with this engine is flatspotting the roller lifters. I do an oil analysis every oil change and there's no wear or non to speak of nor particles in the filter.
What's the collective thoughts of going to a heavier oil say a 10W-30 or a 15W-40?. The lighter oils were supposedly spec'd for mileage which I find hard to believe oil viscosity will make a hill of beans difference on a warm engine. My concern is oil flow at lower temps. Summer's not so bad but winters get as low as -10C around here and I don't want to cause starvation issues. Even saying that, I would think there's more than enough residual oil left on an engine to lubricate it during a cold start until the oil starts flowing. Thoughts?

The Pennzoil Ultra Platinum 5W-30 is a 'lighter' 30w (lower end of the 30w viscosity scale) and is what I used to replace the 5W-20 recommended for my 2019 F-150 5.0. Not only did it quite it down some, I am getting better MPG and upped my 'avg' by .5 over the last 6 months or so without resetting it.

20w is just way to light for a working truck, IMO.