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  • 2018: "Year of Speaking Out!"

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  1. I just completed a test cycle with Royal Purple's Max-Tane booster for diesel engines. The magazine's Dodge Ram 3500 4x4 Quad Cab has nearly 140K miles on its odometer now, and the common rail injector system has never required service. The turbocharger has also been trouble-free. With regular preventive maintenance, fuel filter changes and periodic use of gDiesel fuel when available, there has never been the need for injection system service. We have run octane boosters when taking long trips or hauling. This year's run to Moab for the Jeep Safari plus two subsequent trips to Southern California seemed an ample opportunity to test Max-Tane. Royal Purple states that users can expect several gains from the product. In approximately 5,400 miles of real world driving, we added six (6) 20-ounce cans of Max-Tane to conventional ULSD fuel available in our Western market. This equated to 120 ounces of additive for 300 gallons of fuel. The safe maximum usage calls for one ounce of Max-Tane for each two gallons of fuel, so we leaned toward the maximum to produce the best overall benefits. For the first part of the testing, including the round trip to Moab and nearly 2,000 miles of driving, the additive was at peak ratio. Categorically, these were our findings: 1) The engine's performance was more responsive, with noticeable increases in acceleration and overall throttle response. Throttle was "lighter" at cruise. 2) Fuel mileage was slightly improved. This was not surprising with 4.56 gears and 34.5" diameter tires, as the engine is operating beyond its optimal rpm range at internet cruise speeds. Minimal mileage gains were expected. Testing revealed a mileage increase of 4%-5%. This would likely improve with proper final drive gearing, and we would gladly review the product further after either changing to 4.10 gears or installing an aftermarket overdrive. 3) This engine has always started well. The cold start was immediate, regardless of ambient temperature. 4) Parked overnight in cold weather did not present issues. 5) Tailpipe smoke was reduced dramatically. Upon hard acceleration, there was an absence of the usual black smoke, and this 2005 chassis neither requires nor has a catalytic converter. The tailpipe output has been visibly cleaner under all driving conditions. Worth noting, though, we did not pull a hefty trailer during these tests. In a future test, I would like to check the tailpipe emissions under heavier loads. Overall, this "six-pack" of Royal Purple provided a major cleaning of the top-engine and noticeable reduction in tailpipe pollutants and visible smoke. The performance was tops, it was obvious that the cetane level improved measurably. I would highly recommend this product for "tuning" a diesel engine. The top-engine, valves, fuel system and injectors clearly benefited from the use of Royal Purple Max-Tane. I'm glad we serviced the engine at this level. Injectors, combustion chambers, valves and the exhaust system need this kind of treatment. The inline six, 24-valve ISB Cummins 5.9L with common rail fuel injection, by design a commercial medium duty truck engine, requires this kind of attention. Savings would be measured in increased engine life, fuel efficiency and less fatigue and wear to critical parts. Moses Royal Purple's stated gains: "MAX-TANE PERFORMANCE ADVANTAGES" Increases cetane number by 8 [depending upon ratio of additive to fuel] Increases fuel economy by up to 10% Improves engine startup and reliability in both warm and cold temps Improves cold flow by preventing gelling Cleans deposits from fuel injectors, combustion chambers, intake valves deposits and piston crowns Provides lubricity to entire fuel system Reduces smoke and odor
  2. In the late 1980s, Dodge Truck sales made a dramatic comeback when Chrysler partnered with Cummins, offering a 5.9L inline six-cylinder, 12-valve Cummins engine option. I test drove one of the earliest models with a three-speed A727 Torqueflite transmission. What a difference that powertrain made in contrast to gasoline engines of the era! Since that time, the 12- and 24-valve Cummins ISB and 6.7L options have made Dodge and Ram trucks a major contender at hauling and performance. The 4WD Mechanix Magazine fleet vehicles include a 2005 Ram 3500 4WD with 5.9L Cummins 24-valve engine, featured in projects and for towing chores. Dodge-Ram Cummins owners will find an enthusiastic community at this forum!—Moses Ludel At left, the magazine's 2005 Ram 4WD Cummins model gets showtime at the BFG booth, Off-Road Expo, Pomona! Upgrades like the Mopar running boards or re-valving the 48RE automatic transmission for longevity are some of the details available at the magazine site. Routine maintenance and recommended lubricants, coolant, fluids and filters for the Cummins can be found at the magazine's Dodge-Ram Truck Workshop!
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