The 2018 Ram 5.7 HEMI uses SAE 5W-20 full synthetic motor oil (Chrysler MS-6395), with roughly 7 quarts of capacity including the filter.
In detail, this specification comes from Ram’s owner manuals and service guidelines for the 5.7-liter HEMI V8 used in the 2018 Ram 1500 and related models. The guidance covers viscosity, approved oil quality standards, and practical tips for selecting oil and performing routine maintenance.
Oil type and viscosity for the 5.7 HEMI
To help you quickly identify the right oil, here are the core specifications you should follow for the 5.7 HEMI.
- Viscosity: SAE 5W-20 (full synthetic oil recommended; synthetic-blend acceptable if labeled to meet MS-6395).
- Oil specification: Must meet Chrysler MS-6395 and API SP (or newer), ILSAC GF-5 or newer.
- Capacity: Approximately 7 quarts of oil with a new filter.
- Oil type options: Full synthetic or synthetic blend that meets the MS-6395 specification.
- Quality and brand: Use reputable brands such as Mopar, Pennzoil, Castrol, Valvoline, or Mobil that explicitly state MS-6395 compatibility.
In practice, using a 5W-20 synthetic oil that meets MS-6395 is the industry standard for the 2018 HEMI, providing adequate cold-start protection and engine cleanliness.
Brand choices and maintenance considerations
Drivers should choose a product that clearly lists the required spec and viscosity and sticks to regular drain intervals. Below are guidance points to keep in mind when shopping for oil.
- Check the oil can for viscosity and spec: 5W-20, MS-6395, API SP or newer.
- Prefer synthetic or synthetic-blend oils designed for high-mileage or performance engines.
- Follow the vehicle's oil life monitor or manual intervals; typically 7,500–10,000 miles for synthetic oil.
- Ensure the replacement filter is compatible with your oil grade and engine (e.g., Mopar or equivalent filter designed for HEMI).
Choosing the correct oil specification and maintaining the filter and oil level are essential for protecting the 5.7 HEMI’s rotating assembly and timing systems, and for long-term reliability.
Steps for an oil change and filter replacement
Before performing or scheduling an oil change, review the steps below to ensure a proper procedure and safety.
- Prepare the vehicle: park on level ground, engage the parking brake, and lightly warm the engine to help drainage.
- Gather supplies: about 7 quarts of 5W-20 oil, a new oil filter, a drain pan, a socket wrench, an oil funnel, and rags.
- Drain old oil: remove the drain plug and let the oil fully drain into the pan.
- Replace filter: remove the old filter, lightly oil the gasket on the new filter, and install securely.
- Refill: reinstall the drain plug, pour in roughly 6.5–7 quarts of 5W-20 oil, and check the level with the dipstick.
- Check for leaks and reset: start the engine, inspect for leaks, and reset the oil life monitor if applicable.
If you are unsure about model-specific requirements or regional temperature considerations, consult the owner's manual or your local dealer for guidance.
Summary: For the 2018 Ram 5.7 HEMI, use SAE 5W-20 full synthetic motor oil that meets Chrysler MS-6395 (API SP or newer). The engine takes about 7 quarts with filter, and oil-change intervals typically follow synthetic oil guidelines or the vehicle’s oil life monitor. Choose a reputable brand that clearly states MS-6395 compatibility.