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| AMSOIL User Temperature Test |
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California AMSOIL user Scott Daigleish published, "What is Hot? Drive Line Temperature Lubricant Analysis" in The Turbo Diesel Register.
12,000-mile five-month gearbox and differential temperature study |
| Scott Daigleish, California: Dalgleish described results of an ongoing 12,000-mile five-month gearbox and differential temperature study using his 1995 2500 Dodge 4X4 with a Cummins diesel engine, NV4500 transmission, Dana 70 rear differential and Dana 60 front differential. He filled his gearbox with AMSOIL Synthetic 80W-90 Gear Lube and the differentials with AMSOIL Synthetic 75W-90 Gear Lube, installed temperature sensors and drove the truck in as many different applications as he could. "On the solo runs around town and on the freeway," wrote Dalgleish, "I was never able to get either temperature above 115ºF. If I pushed hard on the freeway up a 7 or 8 percent grade at 70 or 75 mph, bucking head-winds, and outside temperatures around 100º, I could get the NV 4500 transmission up to 135º and the Dana 70 rear differential never passed 120º. "I took several trips hooked up to the trailer and loaded with gear. I sought the most severe conditions I could find, like the 7 to 8 percent grade on highway 395 headed to Dead-man Summit out of Bishop with the outside air temperature at l02º. I left the transmission in fifth gear and pulled the grade at 65 mph. I was never able to get the NV4500 transmission to hit the l90º mark. The Dana 70 rear differential never exceeded l50º. Numerous other trips included highway 50 to Carson City and Highway 5 traveling in both directions over the ‘Grapevine’ netted the same results." AMSOIL Technical Services reports these temperatures are 20º to 50ºF cooler than temperatures normally found in comparable units under comparable conditions. Dalgleish also tested a Gear Vendors Under/Overdrive transmission. He noted that he spoke to Rick Johnson at Gear Vendors, and was told that Gear Vendors was revising its owners’ manuals to specify that synthetics are preferred as post-break lubricants for Gear Vendor products. Gear Vendors tested at least one AMSOIL product and it should appear on the preferred lubricant list, according to Dalgleish. |
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