2021 2500 ram 6.7l diesel 5w 40 oil

[H3LZSN1P3R]

5w40 only 10w30 is LT truck oil IMHO

 

[mbarber84]

Hello guys can you all help me out with using 5w 40 oil in my diesel , I live near Pittsburgh PA and was thinking of going to this oil for the winter but can't find at what temps its used . would you all stick with 10w 30 or switch to 5w 40 for the winter ..? any help or thoughts would be welcome .

I’m 30 minutes south of Pittsburgh and I have been running Amsoil Signature Series Max Duty 10w30 Diesel in my 2022 High Output with no issues. Since the first oil change. Rarely if ever do we see temperatures below zero in the winter here. Also, a true 100% PAO synthetic like amsoil has better cold flow properties and is rated to temps below zero. I use the engine block heater anytime temps drop below 40°F at night anyway. It’s better for the truck to have a warm engine, especially considering I’m less than a minute from Interstate 70 and my daily commute starts out at 75mph within a minute or two. There’s nothing wrong with 10w30 in these trucks, especially if it’s a high quality one. My truck is whisper quiet, makes zero lifter noise, and runs very well. I routinely pull oil samples and send out for analysis at each change. Results have been excellent in the 10-12k mileage range. 10w30 is typically a more shear-stable oil than 5w40, as most oil manufacturers have to load up the blend with a lot of viscosity modifiers (VII’s) in order to generate such a wide range in viscosity. Since these trucks have a habit of putting fuel in the oil from the DPF regeneration process, a shear-stable oil is a good choice. If 10w30 represented a danger to the engine in any way, neither Ram nor Cummins would list it as an approved viscosity for this engine. And that consideration would apply to anything these trucks were intended to do. As long as you’re taking the climate into consideration and using the oil recommendation per the climate, there’s no issue. Millions upon millions of diesel engine hours logged every year with 10w30 in the sump. It isn’t 1950 anymore and lubricating oil designs have come a long way.

 

[DontSlamMyRam]

5/40 T6 all year, -10-105°F. Always has oil pressure when it's running!

 

[Brutal_HO]

5/40 T6 all year, -10-105°F. Always has oil pressure when it's running!

Yea, at least 5PSI or it would light up.

You know that PSI reading is faked from the computer right?