2025 Ram 1500 Fluid Type Specs

As an ASE-Certified Master Technician, I'm here to provide a comprehensive guide to the factory-spec fluids for your 2025 Ram 1500. Using the correct fluids is paramount for the longevity, performance, and warranty compliance of your truck. Always consult your owner's manual for the most up-to-date and specific information for your particular trim and engine configuration, as specifications can vary.

Quick reference

Engine Oil

For gasoline engines in the 2025 Ram 1500, the factory fill and recommended service oil is typically SAE 0W-20, meeting Mopar MS-6395 specification. This specification ensures the oil meets the stringent requirements for emissions, fuel economy, and engine protection set by Stellantis (formerly FCA). Always look for oils that explicitly state compliance with MS-6395 on the bottle. Using an oil that doesn't meet this specification can lead to premature wear and potentially void your warranty. The typical capacity for the V8 engine is around 7 quarts, but this can vary slightly with engine variants and filter size, so always double-check your dipstick after changing.

For EcoDiesel models, the requirement is typically SAE 5W-40, meeting the API CK-4 diesel engine oil classification and Mopar MS-12991. API CK-4 oils are designed for high-speed four-stroke diesel engines and are formulated to provide improved oxidation stability, shear stability, and aeration control. The EcoDiesel generally holds about 10.5 quarts of oil.

Intervals and Pitfalls: Engine oil and filter should generally be replaced every 10,000 miles or 12 months, whichever comes first, under normal driving conditions. However, severe duty cycles (towing, extreme temperatures, prolonged idling, off-road use) may necessitate more frequent changes, often around 5,000 miles or 6 months. Never mix different oil viscosities or types (conventional, synthetic blend, full synthetic) unless specifically recommended by the manufacturer. Using non-spec oil can lead to camshaft and bearing wear due to incorrect lubrication properties.

Engine Coolant

The 2025 Ram 1500 typically uses an Organic Additive Technology (OAT) coolant, specifically Mopar's MS-90032 specification. This coolant is usually purple in color. OAT coolants provide extended service life due to their stable corrosion inhibitors. Critical note: Never mix OAT coolants with HOAT (Hybrid Organic Additive Technology) or traditional IAT (Inorganic Acid Technology) coolants. Mixing different coolant types can lead to chemical reactions, gelling, reduced corrosion protection, and potential overheating or damage to the cooling system components. The average capacity is around 14-16 quarts, depending on the engine and cooling system configuration.

Intervals and Pitfalls: The factory-fill OAT coolant is often referred to as "lifetime fill," but regular inspection of the coolant level and condition is still crucial. Mopar typically recommends inspecting the coolant every 20,000 miles or 24 months and replacing it every 10 years or 150,000 miles. Always use distilled water when mixing concentrate, never tap water, to prevent mineral deposits.

Transmission Fluid

The 2025 Ram 1500 with the 8HP75 automatic transmission (commonly found in gasoline models) requires a specific ZF-approved fluid, typically referred to as ZF LifeguardFluid 8. Mopar markets its version as Mopar ZF 8-Speed ATF. This is a highly specialized, low-viscosity synthetic fluid engineered precisely for the ZF 8HP transmission