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Old 07-22-2009, 04:59 PM
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Amsoil?

I've started using Amsoil 15W-40 in my truck. The service life is 25,000 miles or one year. I do probably around 12,000 miles a year so once a year is how often I would change the fluid. Does this stuff honestly last this long? Running 12,000 miles on one fluid change really enough? I've done one year on this stuff and I'm on my second. I change the filter halfway through.
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Old 07-22-2009, 05:12 PM
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I change my oil & filter once a year. Just did it in june with 17,500 miles. Had a sample tested. Oil was still good. I love it!
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Old 07-22-2009, 06:01 PM
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that AMSOIL is good stuff! my dad uses it in all his 3 PSDs.
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Old 07-22-2009, 06:08 PM
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The absolute most I will go with a 7.3 is 10k miles.
With my 6.0 I go 5-7k

Any more than that I can see it start to loose mileage and power.
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Old 07-23-2009, 08:53 AM
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Thanks guys!
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Old 07-23-2009, 01:40 PM
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25,000 on oil in a powerstroke. Let me explain the reason NOT to do this.

You all know powerstrokes use engine oil to hydraulic the injectors. These pressures are extremely high and inherently creates excessive heat in the oil. High compression with LOW SULFUR Diesel. Just these criteria would take it out of that 25,000 mile threshold. 7000-8500 miles is the most I would go.

Ask yourself what makes amsoil that much better than Mobil or Valvoline? Look through all the marketing bull.
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