While 10W40 is a common and versatile oil, it might not be the *best* choice for all 5.2L Rams. Many modern engines prefer thinner oils for better fuel economy and reduced internal friction. Older engines, however, might benefit from the thicker protection of a 10W40, especially in hotter climates or under heavy loads.
To determine the correct oil, always consult your owner's manual. It will specify the recommended viscosity (like 5W-30, 5W-20, 10W-30, etc.) and oil specifications (like API certifications, like SN, SN Plus, SP, etc.). Using the incorrect oil viscosity can harm your engine. Ignoring the recommended oil specifications can void your warranty.
Don't rely on general advice online; check your manual.
