Rolly Angeles THE TRUTH ABOUT SYNTHETIC OIL Maintenance Excellence THE UNTOLD STORY ABOUT OIL CHANGE : The pins show no wear at all. The piston crowns and lands show a normal amount of carbon. The skirts are very clean with a few fine vertical lines.” All the rings are free. None are broken. No plugging whatsoever in the oil rings.” Probably 95 percent of the crosshatching is still in the liners. No scuffing, no cavitation in the liners. - by independent engine rater On June 21st 1999, at 1,012,825 miles, the above Peterbilt rolled into Covington Detroit Diesel for the 3rd time during the past 9 years for an internal engine inspection. The past two times, at 505,000 and 761,000 miles, Shell Oil and Covington Detroit Diesel personnel inspected the engine for contamination & wear found out no problem at all. After 409,000 miles without an oil change, Mack E7-400 engine in this truck was as wear-free as an engine in comparable service treated to 20x the oil changes. EXTENDED OIL DRAIN DRAIN MYTH or FACT ?

Rolly Angeles THE TRUTH ABOUT SYNTHETIC OIL Maintenance Excellence 1990 Peterbilt at 1,012,825 miles with only 1 unnecessary oil change Rod bearings mark shows no measurable wear Main bearings shows no measurable wear Clean block with no build up Clean head at 1m miles Old oil with 750,000 miles was poured back into the engine, next stop 1.5 miles This Peterbuild is working hard for Pepsi Colain Gulfport, MS This Peterbuild had been running for 9 years at 1,000,000 miles with This Peterbuild had been running for 9 years at 1,000,000 miles with one unnecessary oil change, their findings, exceptionally clean one unnecessary oil change, their findings, exceptionally clean engine with no measurable wear, rings found minimal wear and engine with no measurable wear, rings found minimal wear and was replaced was replaced Howard Hill of Shell (left) were surprise to see how clean the surprise to see how clean the engine was at 1 million miles The Secret, of Gulf Coast Filter Bu-Pass Lube Oil Filter and with The Secret, of Gulf Coast Filter Bu-Pass Lube Oil Filter and with the use of conventional petroleum oil (Shell Rotella T 15W - 40) & the use of conventional petroleum oil (Shell Rotella T 15W - 40) & not synthetic oil. Replacing the GFC filter every 50,000 miles + not synthetic oil. Replacing the GFC filter every 50,000 miles + regular checking through an oil analysis check regular checking through an oil analysis check THE UNTOLD STORY ABOUT OIL CHANGE :

Rolly Angeles THE TRUTH ABOUT SYNTHETIC OIL Maintenance Excellence THE UNTOLD STORY ABOUT OIL CHANGE : No wear at all Very, very good No scuffing and cavitation cavitation Light wear Minimal wear After 409,000 miles without an oil change, Haywood Gray owner of After 409,000 miles without an oil change, Haywood Gray owner of Mack E7-400 have his truck examined by a Mack dealership in Dec. Mack E7-400 have his truck examined by a Mack dealership in Dec. 96 by Dick Malby (certified engine rater) and engine showed light to 96 by Dick Malby (certified engine rater) and engine showed light to moderate wear throughout. The cylinder liners, bearings, pistons, moderate wear throughout. The cylinder liners, bearings, pistons, rings and oil pump were found to be in excellent condition rings and oil pump were found to be in excellent condition Gray’s use of Amsoil Synthetic Heavy Duty Diesel and Marine Gray’s use of Amsoil Synthetic Heavy Duty Diesel and Marine 15W-40 motor oil, Amsoil bypass filter and regular oil analysis check 15W-40 motor oil, Amsoil bypass filter and regular oil analysis check