Time and technology advance. True for cars and true for oil. My 2019 Jeep requires per the manual Mopar spec MS-6395 in grade 0W-20. I don't know if there are any that aren't synthetic based. The one recommended by name in the manual is. While that product will do fine, being in the manual was due to the FCA/Shell agreements. Would I use it in my 340? Not my preference, not often, and not long term, but it would work for one short oil change interval.
