ExxonMobil Delvac Oil Greatly
Jan 1, 2001 12:00 PM, MODERN BULK TRANSPORTER STAFF
Extends Lube Change Interval Engineers at ExxonMobil Lubricants & Petroleum Specialties Company announced the results of an engine disassembly after running the 1995 model Detroit Diesel Series 60 for 790,334 miles on ExxonMobil motor oil. The last 396,830 miles of this test were run without ever draining the engine.
The engine was used in a Tennessee-based truckload fleet that began using Mobil Delvac 1300 Super, a high performance mineral oil. The test engine ran 393,504 miles in a program that called for oil changes every 25,000 miles. After first using Delvac 1300 Super, the fleet switched to Delvac 1, a synthetic motor oil for heavy diesels. Half the fleet was placed on a program that called for oil changes every 150,000 miles. The other half were run until oil analysis indicated that a change was needed.
The engine used in the teardown demonstration had not yet indicated a need for an oil change, although it was approaching 400,000 miles without a change. Laboratory analysis showed less sludge in the Delvac 1 motor oil than in mineral oil. Inspection showed no visible wear on the camshaft or roller followers. In addition, the engine was free of piston crownland deposits, and more than 99% of the cylinder liner still had the original honing pattern visible. Typically, less than 90% of the honing pattern is visible in engines using conventional oil at conservative drain intervals.
ExxonMobil says that the engine selected for teardown was not the best in the fleet. In fact, oil analysis showed it to be nearer an oil change than many others.
For more information, call 1-800-662-4525 or visit www.exxonmobil.com.
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