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Old 12-03-2012, 05:08 PM   #21
raytronx
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I use Shell Rotella 15W-40 and change it every 3000-5000 miles, I tow a lot.
Owners manual says 2500 miles if using the truck for hard duty. 5000 if regular duty.
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Old 12-03-2012, 09:36 PM   #22
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Valvoline Extreme Blue 5-40 full synthetic.
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Old 12-04-2012, 03:26 AM   #23
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Diesel Use and Oil Changes

Last year I put 2K miles on my diesel. If I went my miles alone, it would be a long time to get to 5K or 7.5K miles before changing the oil. Is once per year adequate enough with low miles?
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Old 12-04-2012, 07:57 AM   #24
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Quote:
Originally Posted by wrighfr58 View Post
Last year I put 2K miles on my diesel. If I went my miles alone, it would be a long time to get to 5K or 7.5K miles before changing the oil. Is once per year adequate enough with low miles?
I would try doing an oil sample test and go by the results of that. As long as there are no harmful buildups or dilution I would say there is no problem extending time and a $20 sample is cheaper than an oil change. (If it shows no problems)
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Old 12-04-2012, 10:59 PM   #25
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Quote:
Originally Posted by wrighfr58 View Post
Last year I put 2K miles on my diesel. If I went my miles alone, it would be a long time to get to 5K or 7.5K miles before changing the oil. Is once per year adequate enough with low miles?
Must only drive to tow the 5er, what a waste of a beautiful truck. I would agree with the pull the sample, depends on who changes your oil. It runs $25 to $35 for testing at Blackstone Labs, I can change for about $50 if I get my oil on sale, and as I only change about once a year not a problem.
You need to get out more often and go farther on each trip, diesles don't like doing a bunch of short driving.
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Old 12-05-2012, 08:30 AM   #26
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Or you could send that pretty truck on vacation to New Jersey and I would be glad to put some miles on it ..... Heck, I would even return it with fresh oil change. I'm not a Ford guy but I am willing to sacrifice for the cause. Hank
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Old 12-18-2012, 05:39 PM   #27
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I use Amsoil first because I like the proven results on the wear ball test but also because Mercruiser calls for the same weight in BOTH of my 496's in the boat. The Mercruiser synthetic cost more then the Amsoil and the Mercruiser blended semi synthetic is about the same. So I choose to buy in bulk once a year for the truck and boat, 10 gals in total giving me little spare.

My truck is fairly low miles per year at about 5000 a year and an oil change once a year here in the warm AZ climate is fine.
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Old 01-16-2013, 01:39 AM   #28
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I run T6 in my 6L...seems happy with cold starts.
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Old 01-16-2013, 07:44 AM   #29
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OK I will be the odd one on this subject, I use Schaeffer 5/40 in everything from the pressure washer up to the semi trucks and have been using it for 10 years. Crazy I am but I still change oil every 3000 miles. My dealer says im throwing money out the window, I guess I have the old school thinking still in my head.
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Old 01-16-2013, 11:34 AM   #30
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Valvoline blue in my cummins change it every 5000.
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Old 01-20-2013, 05:07 PM   #31
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I have a micro trucking company with medium duty trucks. I change my oil twice a year for every truck. Miles can be anywhere between 5,000 miles and 15,000 miles. Typically the 5,000 miles would be the 7.3L and 15,000 could be for the DT466E. I buy oil by the drum. Sometimes I get bargains and sometimes I do not. I usually buy the "house" brand which most claim to be the Chevron Delo. When I say house brand I mean the supply companies branded oil. Regardless of brand I always get 15W-40.

I recently overhauled my 7.3 out of the pick up truck with 250,000 miles and the engine was spotless inside. I was surprised considering I change my oil by calender and not miles. Overhaul was because of driver (me) and utilizing the large injectors and turbo. The bearings were perfect and could easily have gone another 250,000, but the hole in the piston had to be fixed! With that being said, hard miles and calender oil changes seem to work just fine even for my engines with Hydraulic Injection systems. Hydraulic injection systems have a tendency to shear the oil and require more frequent oil changes. My 5.9L gets the exact same treatment.
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