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We still have the oem's in our 2006 Cummins Ram 3500 and they seem to be working well after 83,000 miles. We live in Illinois and one of the characteristics of the Cummins engine is that the intake air heater ( in place of glow plugs) takes a huge amount of current. When the engine is cold the lights will dim and go back to normal every 20 seconds or so as the heater comes back on. At first I thought I had a bad alternator but I finally determined that it was the heaters cycling on and off. The dash voltmeter drops like a rock when the heaters kick in.
Because of the high peak current requirements I'll replace them with as heavy a battery as I can fit sometime in the next 6 months.
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