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Old 09-02-2014, 06:03 AM   #11
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I change the oil in my truck every 7500 miles and I use Valvoline Premium Blue Extreme full synthetic and factory filters. The cars are every 5k using Mobil 1. I send oil samples from my truck off to Blackstone Labs from every oil change and they are saying that I can go 10k...doubt I will ever do that but it's nice to know that the oil I'm using has some life left in it.

Dave and Amy
5 kids...2 with 2 legs, 3 with 4 legs
2008 Jayco Jay Flight G2 29FBS "No Worries"...traded in on a...
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Old 09-02-2014, 07:10 AM   #12
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mobile 1 5w30 in TV dx every 5k. been doing it that way since 1998. still tight, and clean.

2012 Jayco 184BH
1998 Ford F150 Supercab. Original owner
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Old 09-02-2014, 07:26 AM   #13
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I use full synthetic every change and do it when my DIC tells me I have to..
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
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Old 09-02-2014, 07:41 AM   #14
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I also use full synthetic and WIX filters. I change mine generally when the DIC says there's 30% oil life left, not sure of the miles, but I'll start tracking that better. If based on total miles, it works out to about every 7000 miles. Manual says to use the DIC, but it's been so long since I read it, I don't remember a mileage interval being stated. I'm pretty hard on my truck, so I figure early is a good policy. When I change it, I do a quick unscientific inspection, and the oil seems to be pretty spent at that time, so I'm comfortable with this interval.

DW's '06 XTerra also gets the full synthetic treatment, but hers is about 2x a year. She's still swallowing the 3,000 mi koolaid, but we don't put a lot of miles on her car, and I do the changes myself, so it's not worth fighting about. $100 a year is cheap for a decent marital peace treaty.

IMHO I would only use 3k miles as an oil service interval if I were REALLY hard on my truck, or if I were using cheap oil and filters. For the average driver using higher end synthetics and filters, 5k - 7k miles is much more reasonable with today's motors.

2014 Jay Flight 28 BHBE
2015 RAM 2500 6.4L HEMI, Tradesman 4x4, 3.73
Blue Ox SwayPro (BXW 1503)

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Old 09-02-2014, 07:52 AM   #15
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Our Toyota Camry Hybrid has an oil change around 5,000 miles, as recommended by the dealership. The computer on my GMC D/A combo indicates a change at 10,000 miles, buy I have put in Amsoil Synthetic and hope to get 15,000 or so between oil changes. At 6,000 miles I changed out the oil filter and put a quart of synthetic oil in to replace what was lost when changing out the filter. Did this with my 2003 GMC D/A combo and didn't have any problems.
2012 GMC 2500HD D/A Crewcab
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Old 09-02-2014, 08:30 AM   #16
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I go by the DIC on both my 2011 Cruze and my 2007 2500HD Duramax. I change the oil on the Cruze when the DIC says 10% left, which is at about 4200-5300. I change it every 12 months on the 2500HD. I don't drive the truck enough to get to 10%. It's normally over 50% left when I get to 12 months and at about 5000 miles.
2015 Chevy Silverado 2500HD LT 6.0L 4.10
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Old 09-02-2014, 08:46 AM   #17
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Lots of chatter on oils. I try to change my oil a couple times a year just to keep the acids down. My Dakota’s manual says every 5K miles is fine for light duty work/commuting. Change it every 3K miles for heavy duty work (towing, dirty working conditions). It does not specify synthetics. I have not towed much this year, so I changed it last week at 4K miles, and it had been 9 months since the last oil change.
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Old 09-02-2014, 11:19 AM   #18
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I change mine whenever the DIC says about 5% oil life remaining. I also use the recommended oils. For my Malibu it's Mobil 1, for the truck it's regular dino oil, 15W-40 diesel oil. To change it any more frequently is just a waste of time, money and oil. To run synthetic oil through an engine designed for regular oil is also a waste of money if you change your oil as you should. The Duramax is not a high RPM, high heat engine, which is where a synthetic oil may have an advantage.
Use what your manual tells you to use, and follow the recommended schedule, and you can't go wrong. Every 3,000 miles is old school, and no longer required with todays modern engines.

Becky, Bob and Taylie & Bode
2009 Silverado 2500HD Duramax/Allison
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Old 09-02-2014, 01:32 PM   #19
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The 3000 mile interval is now only for "severe service" in most manuals. I would consider towing a RV to fall under that category. For normal use, I change oil at around 4500 miles and only use Pennzoil conventional. Have never had an internal engine problem. I know, I know, we could talk oil mileage and preferences all day and would be hard pressed to get a consensus. I guess I`m still somewhat old school. On another note, my Yamaha 4 stroke outboard with 5700 commercial use hrs on the clock has had only Yamalube conventional, changed about every 100 hrs as the book recommends.

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Old 09-02-2014, 01:50 PM   #20
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Rotella T5 in my Powerstroke every 5000 miles. Motorcraft filters.

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