The Ram 1500 has built a strong following among Oklahoma truck buyers — the coil-spring rear suspension (previously unique among half-tons), refinement, and available HEMI V8 make it a standout. The EcoDiesel option appeals to high-mileage drivers who value fuel economy. Both powertrains have specific maintenance demands that Oklahoma climate makes more pressing.
Norm’s Auto Clinic services Ram trucks regularly. Here’s what we’ve learned about keeping them running well in our demanding environment.
Ram HEMI V8: MDS Oil Consumption and Tick
The Ram 1500’s 5.7L HEMI V8 uses Multi-Displacement System (MDS) to deactivate four cylinders during light-load driving — similar to Chevy’s AFM system. MDS cylinders use switchable roller rocker arms that can stick or wear at high mileage. Symptoms include a ticking noise from the top of the engine and rough idle when MDS activates.
The HEMI is also known for a valve train tick that develops after the engine cools down and appears on startup — often called the ‘HEMI tick.’ This is partially normal for the direct-actuation valve train design, but a persistent or loud tick warrants inspection. Using full synthetic oil meeting Chrysler’s MS-6395 specification and changing it every 5,000 miles reduces the risk of tick-related valve train wear.
Like other MDS/AFM-equipped V8s, some HEMI owners report above-average oil consumption (1+ quart per 3,000 miles) from the MDS cylinder deactivation cycling. Monitoring oil between changes and using 5W-20 or 5W-30 full synthetic meeting Chrysler’s spec is the best approach.
Ram ZF 8-Speed Transmission and Air Suspension
The Ram 1500’s ZF 8HP70 8-speed automatic is a world-class transmission — smooth, efficient, and generally very durable. But like all automatics, it benefits from fluid changes every 40,000–60,000 miles, especially on trucks that tow. Ram lists the fluid as ‘lifetime’ in some documentation; we disagree. Heat degrades transmission fluid, and towing in Oklahoma summers accelerates that degradation.
Ram’s available Air Ride Suspension (coil-spring air bags at all four corners) provides a supple ride and adjustable height — but the air springs, air compressor, and height sensors are wear items. Air spring leaks (often indicated by the truck sitting low or the compressor running constantly) typically develop at 80,000–120,000 miles. Replacement air springs cost – per corner. Keeping the undercarriage clean and free of corrosion extends their life.
Ram EcoDiesel and Spark Plug Service
The 3.0L EcoDiesel V6 (when available) is an excellent long-distance hauler for Oklahoma’s highway-heavy driving patterns. Diesel maintenance differs from gasoline: oil changes at 10,000-mile intervals with diesel-specific full synthetic, fuel filter replacement every 20,000–25,000 miles, and DEF (Diesel Exhaust Fluid) monitoring are the key items. A diesel engine ignored on these intervals can fail its diesel particulate filter — a ,000–,500 repair.
For HEMI-equipped Rams, spark plugs should be replaced at 30,000–60,000 miles depending on plug type. Ignition coil failure is also common on higher-mileage HEMIs and typically presents as a misfire on one or more cylinders.
Ram Truck Service at Norm’s Auto Clinic
We service Ram 1500, 2500, and 3500 trucks at Norm’s Auto Clinic — from HEMI oil changes and MDS diagnostics to transmission service and air suspension repair. Our experienced technicians understand these trucks and how Oklahoma owners use them.
Call (918) 279-8100 or visit 11150 S 265th E Ave, Coweta, OK 74429. Serving Ram truck owners from Coweta, Broken Arrow, Wagoner, and the Tulsa metro — Monday–Friday, 8am–5pm.