The Ultimate Used Ram Truck Inspection Checklist: What to Look For Under the Hood

Recent Trends in the Used Ram Truck Market

The used full-size pickup segment has seen sustained demand, with Ram trucks maintaining a strong resale presence due to their combination of towing capability and passenger comfort. Recent market observations indicate that pre-owned Ram 1500, 2500, and 3500 models from the 2013–2019 generation remain among the most frequently listed vehicles on dealer lots. Buyers are increasingly focused on under-hood condition, as powertrain repair costs for late-model trucks have risen significantly across all brands.

Warranty expiration patterns also drive inspection urgency: many Ram trucks from the 2016–2020 model years are now moving out of factory coverage, placing the burden of pre-purchase evaluation on individual buyers. This shift has elevated the importance of systematic under-hood checks before committing to a purchase.

Background: Common Ram Powertrain Generations

Ram trucks have used several distinct engine families over the past decade, each with its own inspection priorities:

• 3.6L Pentastar V6 (gasoline): Widely used in light-duty 1500 models; known for smooth operation but requires attention to oil cooler housing and cooling system seals in higher-mileage units.
• 5.7L HEMI V8 (gasoline): The most common Ram engine; owners should check for the well-documented "HEMI tick" and multifunction displacement system (MDS) lifter wear.
• 6.7L Cummins I6 (turbo diesel): Found in 2500 and 3500 models; inspection focus should be on the exhaust gas recirculation (EGR) system, turbocharger health, and fuel system components.
• 6.4L HEMI V8 (gasoline): Used in heavy-duty models and some special editions; similar inspection approach to the 5.7L but with distinct cooling system demands.

User Concerns: Key Under-Hood Inspection Points

Experienced Ram mechanics and enthusiast forums consistently highlight several areas where a focused checklist can identify potential problems early. These are the most common user concerns:

Engine Oil and Leak Assessment

• Pull the dipstick and check oil color, consistency, and level. Dark, gritty, or milky oil suggests neglected service or coolant contamination.
• Inspect the valve cover gaskets and oil pan seam for seepage. Minor weeping is common on higher-mileage 5.7L HEMI engines, but pooling oil indicates a repair need.
• Check for oil residue around the oil filter housing adapter—this is a known leak point on Pentastar V6 units.

Cooling System Integrity

• Examine coolant reservoir condition and fluid level. Low coolant or orange/brown discoloration may point to internal cooling system corrosion or a head gasket concern.
• Inspect radiator hoses for cracking or swelling at the ends, especially on trucks with over 80,000 miles.
• Look for white crusting around the water pump weep hole—this can signal impending pump failure.

Belt, Pulley, and Alternator Check

• Run the engine and listen for chirping or squealing from the serpentine belt area. Worn tensioners or pulleys are common on Ram trucks in the 60,000–90,000 mile range.
• Check alternator output by observing headlight brightness at idle and under slight electrical load. Dimming lights may indicate a weak alternator or battery.

Turbo and Air System Inspection (Diesel Models)

• On 6.7L Cummins engines, listen for unusual whistle or flutter during acceleration, which can indicate turbo bearing wear.
• Inspect intake piping for soot buildup or loose clamps—signs of boost leaks that affect fuel economy and power.
• Check the EGR cooler area for coolant seepage, a known area of concern on earlier Cummins generations.

Likely Impact: How Thorough Inspection Affects Ownership

A disciplined under-hood review can reduce the risk of surprise repairs within the first year of ownership. For a typical used Ram truck in the $25,000–$45,000 price range, undiagnosed engine issues can represent $2,000–$7,000 in immediate repair costs if problems like HEMI lifter failure or Cummins EGR cooler blockage are overlooked.

Buyers who complete a structured inspection are better positioned to negotiate repair credits or walk away from trucks with borderline mechanical health. Dealers and private sellers also respond more favorably to buyers who demonstrate technical awareness, especially on higher-mileage diesel units where maintenance history gaps are common.

The checklist also helps buyers separate cosmetic wear from genuine mechanical risk—a dusty engine bay with a recent oil change sticker is generally less concerning than a spotless bay with a low coolant reservoir and unexplained oil streaks.

What to Watch Next

Several developments are worth tracking as the used Ram market continues to evolve:

• HEMI lifter pattern by model year: Enthusiast communities are reporting that 2015–2018 5.7L engines may have a higher incidence of MDS lifter failure. Check independent service records for any lifter-related work on those model years.
• Cummins DEF system updates: 2019 and newer diesel models have revised selective catalytic reduction (SCR) components. Early reliability data is still emerging, so test trucks in this range thoroughly.
• Independent inspection services: Third-party mobile inspectors are becoming more common across major metro areas. For buyers without mechanical experience, a pre-purchase inspection from a specialist adds documentation and leverage.
• Warranty transfer policies: Some Ram certified pre-owned programs include transferable powertrain coverage. Verify remaining warranty on any dealer-sold unit before relying on it as a safety net.

As the used truck inventory cycle continues to turn over, the value of a structured under-hood inspection will only increase. Buyers who combine the above checklist with a test drive and a review of service records give themselves the best chance of finding a Ram truck that delivers long-term utility without hidden mechanical compromise.