This excerpt was originally posted on the John Deere, Straightforward Blog July 29, 2011. You can view the original post here.

Earlier this week, we dove into the issue of engine oil choices for John Deere Interim Tier 4 engines. We provided a list of key terms to know when navigating the engine oil decision, and provided John Deere’s best practice recommendation for your engine: Using CJ-4 oil grades to extend service life and maximize efficiency and performance.

Today we expand on the role of engine oil in Interim Tier 4 engines. Here are four reasons why CJ-4 oil grades are the best choice for your new Interim Tier 4 equipment:

DPF Service Life – As we discussed last week, CJ-4 oil grades are specially blended to reduce trace metals and SAPS (sulfated ash, phosphorus and sulfur). Using oils with high levels of SAPS in Interim Tier 4 engines, reduces the performance efficiency of the diesel particulate filters and diesel oxidation catalysts these engines utilize to meet emissions standards.

Heat – Heat affects off-highway engines much more than on-highway. Off-highway engines work much harder in heavily loaded conditions. Plus, they don’t receive the cooling effect from highway travel; every time you raise the temperature by 10 degrees Celsius (about 20 degrees Fahrenheit)—which is typical between on and off-highway applications—you double the oxidation rate of the oil. CJ-4 oil, particularly John Deere Plus-50 II™, which has been formulated specifically to inhibit oxidation, deposit, corrosion and wear with superior root control in Interim Tier 4 engines.

Engine Wear – Lab and field tests reveal that the superior anti-wear additives in quality engine oils can significantly reduce engine wear, increasing the productive life of the engine. Quality engine oils also extend drain intervals and reduce piston deposits, which leads to a cleaner engine that will last longer and provide consistent power.

Soot-Handling – Compared to the previous CI-4 oils,CJ-4 has been shown to be much more stable and to have better soot-handling capabilities, which is important in new engines that also rely on cooled exhaust gas recirculation (EGR) technology. Recirculation of exhaust gas lowers peak combustion temperatures and reduces nitrogen oxide (NOx) emissions, but can potentially increase the level of soot in the engine oil as partially burned hydrocarbons are fed into the cylinders. Managing soot in cooled EGR-equipped engines is important because excessive soot can build up and cause abrasive wear, which could accelerate filter plugging and high back pressure in the exhaust filters. The new CJ-4 oil formulations have better antioxidants and dispersant additives that are capable of handling additional soot levels.

It’s always been important for owners and operators of off-highway diesel engines to follow the manufacturer’s oil-type and service-interval recommendations, and with Interim Tier 4 engines it’s even more important to follow those recommendations.

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