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Old 08-28-2015, 09:32 AM   #21
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Sounds like the fuel wash down messes up my old way of doing things but I used to run an oil test every 3000 miles for 35.00 and then change the oil when the test show less than 30% of oil life remaining. The mileage you get out of a tow vehicles oil varies wildly with driving conditions and load.

AMSOIL Oil Analyzers Test Kit, Postage Pre-Paid

Yes I run Amsoil but I have run other synthetics such as Royal Purple and obil 1. Some of my vehicles have run over 30000 miles before I performed a change and some have needed a change after 6000 miles.

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Old 08-28-2015, 12:47 PM   #22
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Does anyone use a test kit to check your oil? I saw on a dmax forum to just change your oil filter that way you only lose a quart of oil. I use synthetic oil and I was changing around 6,000 miles but now it's closer to 10,000 miles. I now change the oil with what it says on the truck but I think I'll buy a test kit and change with what it says

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Old 08-28-2015, 01:01 PM   #23
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8k miles, I use to change my own, filter and oil normally cost me $52 but our local Ford shop (Gator Ford Tampa) charges $49.95.. just can't complete and it not cheap oli either.
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Old 08-28-2015, 01:08 PM   #24
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Good info fellas.
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Old 08-28-2015, 01:17 PM   #25
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Use 15 quarts of Motorcraft 15W40 and Motorcraft filter every 4,000 miles. And change Motorcraft fuel filters every other oil change. Sometimes I change the engine oil myself, but usually at the dealer as the pricing is too close to what I pay doing it myself. Always change the fuel filters myself as I can do it for about $100 less than the dealer.
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Old 08-28-2015, 01:25 PM   #26
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Why not change filter with every oil change? If you don't aren't you just running clean oil thru a dirty oil filter?
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Old 08-28-2015, 01:29 PM   #27
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Old 08-28-2015, 01:33 PM   #28
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Duramax 2500 HD. Every 5000.
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Old 08-28-2015, 01:37 PM   #29
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I just got mine and the dealer wants to change it at 10000 KMS, (about 6250 miles) the first four are free so I don't really care right now, my last diesel back in 2006 I did when the DIC told me to and that was generally about 18000 KMS about 11250 miles.
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Old 08-28-2015, 01:38 PM   #30
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Originally Posted by mikejm View Post
Why not change filter with every oil change? If you don't aren't you just running clean oil thru a dirty oil filter?
I think he said the Dmax forum said "just" change the filter.Guess the thinking is it goes in the filter dirty and comes out clean so you throw away one dirty qt. of oil
I think

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