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Old 08-28-2015, 05:53 AM   #11
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5,000mi or 200 hours, whichever comes first. I use 15 qts. 5w40 T6 full synthetic Rotella and Motorcraft filter only.
Usually 3-4 times a year.
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Old 08-28-2015, 07:03 AM   #12
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Rotella Synthetic and usually when the "life" monitor gets to around 25%. Which over the last two years has worked out to about 8000-9000 miles each time.
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Old 08-28-2015, 08:34 AM   #13
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Amsoil every 25k.
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Old 08-28-2015, 08:56 AM   #14
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Rotella 15w40 summer, but plan to switch to 5w40 full synthetic in winter and will likely use it going forward.
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Old 08-28-2015, 09:04 AM   #15
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For my Ford 6.7, I let the onboard computer tell me when the oil needs changing. I use the Motocraft 10w-30 semi synthetic.
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Old 08-28-2015, 09:18 AM   #16
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Rotella 15w40 every 5000 miles with K&N filters.
Change the fuel filter every other oil change.
I have these on all of my vehicles and it makes the process alot easier: Fumoto USA | Quick and Easy Engine Oil Drain Valves
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Old 08-28-2015, 09:19 AM   #17
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spock,beware dpf regens.

whats your location,the year make model and mileage ??? and do you pull hard and get hot.
there are many factors to consider....look at that little book in your glove box....everyone should know what severe service is.
you'll go thousands and thousands of miles if you service as required...if not, hope you have a deep pocket. happy trails.
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Old 08-28-2015, 09:31 AM   #18
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With the new designed series of engines to comply with the emission rules and CAFE standards; you must follow the engine manufactures guide lines for changing the engine oil. You can change slightly sooner around 5,000 miles which I do; but do not go beyond the engine manufactures recommendations.

I have found that the biggest issue with the new emission strategy is fuel dilution due to the late injections of fuel to burn off the soot in the DPF. This is part of the regeneration process and fuel is used to burn in the DPF. When this occurs the fuel can and does wash the cylinder walls and enters the oil sump. I too monitor the oil quality and my fuel dilution is normally less than 1%. Cummins recommends no more than 4 to 5% fuel dilution in 7,500 miles. Now when using the new DEF systems the fuel burn is not as much for regeneration but still can occur.

Sorry for the long dissertations but I think diesel engine users should be aware of the oil requirements for their new engines. They are not like their fathers diesel engine.

I use Shell Rotella 15W-40, 3 gallons; with a Fleetguard StrataPore oil filter full flow with a 10um rating.
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Old 08-28-2015, 09:41 AM   #19
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I have a 2012 non def 6.7, I change every 10K give or take on the amount of towing I did during the oil life span. I use M1 DELVAC. I do the same with the same oil in my 2012 VW Jetta TDI as well.
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Old 08-28-2015, 09:57 AM   #20
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I have been using Rotella T 5w40 full synthetic In my 7.3 for the last 8 years.

Now retired I don't put that many miles on so I change once a year, prior that I would change every 8k.. and for a diesel the synthetic oil still came out looking like oil and not tar.

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