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2005 LLY Duramax - 230k Miles - 7k miles on oil #5454583 06/15/20 04:55 PM
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shibby6600 Offline OP
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28k miles since head gasket and upper end rebuild. Oil has been changed at least 3 times since then. Mobil Delvac ESP 5w-40 with XG9100 filter, 7k miles on this oil change for both oil and filter.

Disregard them calling it a Cummins. It's not, I double checked.

01 05 3500-200528 - redacted.png
Last edited by shibby6600; 06/15/20 04:55 PM.
Re: 2005 LLY Duramax - 230k Miles - 7k miles on oil [Re: shibby6600] #5454642 06/15/20 05:57 PM
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loneryder Offline
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They think it’s a Cummins

Re: 2005 LLY Duramax - 230k Miles - 7k miles on oil [Re: shibby6600] #5454675 06/15/20 07:02 PM
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JohnnyJohnson Offline
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Probably some of the best wear metals I've ever seen on a Duramax diesel oil report.


2004 Corolla 140708
Out: Pennzoil Platinum HM 5W-20 ST 4386
In: Valvoline Synpower Full Synthetic 5W-30 Purolator PureONE
2006 Duramax 77117
Out: T6 5W-40 XG9100 73909
In: Rotella Dino PH9100 11-3-19
Re: 2005 LLY Duramax - 230k Miles - 7k miles on oil [Re: shibby6600] #5454955 06/16/20 06:50 AM
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dnewton3 Offline
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Completely expected wear rates, and that's a good thing.

If you intend to OFCI at or less than the IOLM, then ditch the expensive syns and just use any decent HDEO. You'll get the same wear for less investment.

Last edited by dnewton3; 06/16/20 06:50 AM.

The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
Re: 2005 LLY Duramax - 230k Miles - 7k miles on oil [Re: shibby6600] #5455010 06/16/20 08:08 AM
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shibby6600 Offline OP
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I typically get the synth oils on sale, like the last T6 sale and rebate I posted where it costs around $25 for an oil change in the end. I also like the cold starting 5w-40 gives in the middle of winter. Hard to find non-synth 5w-40 in my area (if there is such a thing?).

Currently 1000 miles on new oil, still yet to turn black. The XG filter and blocked EGR keep the oil clean for a while. Usually starts darkening around 2000-2500 miles. I'll try going 10k on this change.

Re: 2005 LLY Duramax - 230k Miles - 7k miles on oil [Re: shibby6600] #5455017 06/16/20 08:17 AM
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Last edited by 4WD; 06/16/20 08:22 AM.
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