Safe to use 5W-30?

[roaniecowpony]

Manufacturers don't want cars that last forever. It's a cumulative liability and the makers don't make money from a 20 year old fleet. Your JK, TJ, CJ etc, is a liability to them

The light aircraft industry almost died from all the airplanes that were still flying many decades after they were made. Light aircraft, although built like a tin can, are rebuilt and repaired, crutched up and kept in service forever. People were suing the pants off of makers like Cessna, Beechcraft, and Piper for airplane crashes and issues on planes built 30, 40, 50, 60 years ago. The US government had to pass legislation that limited liability General Aviation Revitalization Act - Wikipedia

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[Smokey_The_Rooster]

BTW, I live in GA and it's pushing 90 already and I always use 89 or above octane gas. Thinking 5w30 summer then back to 0w20 or 0w30 in winter.

 

[Pape]

BTW, I live in GA and it's pushing 90 already and I always use 89 or above octane gas. Thinking 5w30 summer then back to 0w20 or 0w30 in winter.

Since the engine can handle 0w I would go 0w at any chance.
w30 is 37% thicker between 32F and 41F than w20 at any given time.
The question: in the winter, does your oil really get hot where you need / want to extend the viscosity ?

For me, up north, in the winter I rarely hit 212F but I do see a lot of 41F and lower temps. Me personally, I do thicker oil for extended protection at higher temperature.

 

[andrei]

Wanna see retardation? Hop on any car forum and search for word "oil".
Idk, it must be chemicals and fumes that trigger it...

For the clueless ones, viscosity of the same weight oil fluctuates between manufacturers. Some w20 on upper spectrum are as thick as some w30 on lower spectrum.

 

[JINO]

What oil grade would be good for the 3.0 diesel in hot weather?

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