We now recommend Mobil Delvac Elite 15W-40 motor oil for your Newell coach’s heavy-duty Cummins ISX diesel engine. This replaces our previous recommendation that you use Mobil Delvac 1.
The drain interval when using Delvac Elite 15W-40 remains the same as it was with our previously recommended oil: 15,000 miles or 12 months, whichever comes first. But using Mobil Delvac Elite 15W-40 cuts the cost of fluids for your oil change by roughly 50 percent, saving you several hundred dollars on the cost of the oil itself.
Since 1989, Newell has been using synthetic oils and fluids for original factory fill and coach maintenance. In recent years, however, Mobil has developed a high-quality line of motor oils that are blends of synthetic and conventional mineral-based oil rather than full synthetics. The blended oils provide performance advantages previously available only in the full synthetics, and at a significantly reduced cost. Mobil Delvac Elite 15W-40 is one of these blended products.
Mobil’s official information regarding Delvac Elite 15W‑40:
The quality and reliability built into Mobil Delvac Elite
15W-40…delivers the highest level of protection for new diesel
engines and older models.
Key benefits include:
• Oxidation performance superior to most conventional oils.
• Excellent anti-wear and anti-scuff properties.
• Excellent low-temperature performance allows oil flow
to critical bearing surfaces at start-up and controls low-temperature
sludge formation in stop-and-go service.
• Sheer stability protects engine parts at high operating
temperatures and reduces oil consumption.
What about oil used in other components?
Generators: We continue to recommend Mobil Delvac 1 ESP full-synthetic lubricating oil for our generators. The recommended oil-drain interval is still 500 hours. For conventional or blended oils, the generator manufacturer specifies a 150-hour drain interval.
Transmissions: We continue to recommend Mobil Synthetic ATF for our transmissions. The Allison five-year warranty requires that you use an approved full-synthetic ATF in order to receive the five years of coverage.
Other components: We continue to recommend full-synthetic lubricants in selected other Newell components and ZF-specific lubricants for ZF components.
Still prefer full-synthetic engine oil?
The Newell Service Department continues to offer Mobil Delvac 1 ESP 5W-40 for those who prefer to use a full-synthetic motor oil.