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Old 03-18-2011, 11:11 AM
Anthony C Anthony C is offline
05 Dodge Ram 6Spd.5.9 CTD
 
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Default Cummins oil change intervals

What does Cummins recommend for oil change intervals (mileage) I'm a synthetiic oil freak. I worked for a trucking co. as a reefer (refrigeration technician) repair man for refrigerated trailers. Well this co. had test oil brought in by the 55gal drums. No one knew what oil it actually was until the test was completed. It turns out that it was a 15/40 Mobile 1 Delvac synthetic motor oil. This oil and a new filter was used in this particular engine (a 3406E 550 Caterpillar engine) for 500,000 miles. The oil filter only was changed every 25,000 miles, and every 75,000 miles the oil and filter were changed. This went on for 500,000 miles! Mobil 1 came in after 500,000 miles and completely tore the engine down to see how well their oil performed. It passed the tests with flying colors!!!!!! All the rod and main bearings were put back into the engine, all the camshaft bushings and camshafts were reused as well. The rings were replaced only, becaused they were used to prove their point. So I'm convinced that synthetic oil does it's job. The oil pan was so clean, all you had to do is wipe the oil off, and eat out of the pan! Catterpillar themselves couldn't believe it! Well it's true, I witnessed it with my own eyes. Seeing is believing, and couldn't believe my eyes. This is gospel. I've been in the trucking business for over 30 years. I now build air conditioners for the US Army. In my own personal opinion, synthetic motor oil is the way to go. If I didn't use synthetic oil, it would be either Shell Rottella 15/40, or Mobil Delvac (the million mile oil) 15/40. Chevron is another good mineral oil, I've used that in my Oldsmobile Diesel for 185,000 miles. My Nephnew blew the engine at 193,000 miles, the crankshaft broke in half! That wasn't the oil's problem, it was the engine's problem. Those engines were experimental engines, toys to the Diesels of today. Thanking you in advance,
Anthony c
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Old 03-18-2011, 11:57 AM
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MnTom MnTom is offline
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6000 miles per my owners manual (1996). I run about 12,000 miles (1 year) between oil and filter changes, but I am also running synthetic. I changed to synthetic at about 175k miles and I don't have to add any oil between changes. I pulled the head and my engine was like you said, just wipe it off and it is clean! I am convinced that synthetics are the way to go. I also have synthetic in the transmission and rear end too.
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1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
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Old 03-19-2011, 10:04 AM
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stodg73 stodg73 is offline
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I change the oil in my truck between 5,000 and 7,500 miles, or every 6 months. And now, I am using full synthetic all around.
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Old 03-19-2011, 02:30 PM
Anthony C Anthony C is offline
05 Dodge Ram 6Spd.5.9 CTD
 
Join Date: Mar 2011
Location: Pennsylvania
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Default Mobil 1 5W40 Turbo Diesel Motor Oil

My intention is to change the fuel and oil filters every 6,000 miles. Change the oil, every 12,000. mobil 1. 5W40 Turbo Diesel Motor Oil. If a 3406E Caterpillar can go with a 75,000 oil change inervals for 500,000 miles, and be ready for more punishment. I'm more than confident, a 12,000 mile oil change is a walk in the park. The oil is very capable of doing it's job. The thing is to keep an eye on the oil level. I have almost 7,000 miles on my last oil change, and I haven't added an ounce of oil yet!:cool:
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2005 Dodge Ram 5.9 CTD 4X4 6Spd NV 5600 373 Ratios. Spyn Tec Lockout Hubs. Carli Front Suspension Components. 285/70R17 Michelin LTX MS/2. Complete Banks Power Pack System, including cold air intake with scoop. 5" Magnaflow Turbo Back Exhaust. Hunter Running Boards (blade series). OEM Mudflaps. Undercover Tonneau. Recon LED Smoked Tail Lights.
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Old 03-19-2011, 06:10 PM
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If you had your oil analyzed at regular intervals you could probably go a lot further on your oil. I don't remember who it was (they were all road miles towing light with a by pass filter), but they had 35,000 miles on the oil and analysis said it was still good.
Oil does not deteriorate, but the additives get depleted and the oil fills up with contaminants such as soot, fuel, silica (dirt), etc. That is why the oil needs changed.
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1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound
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