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5k mile oil changes keep things simple and easy to remember.  AMSOIL's OE would serve well and as a Preferred Customer the cost is on par if not less than most off the shelf oils.  Use an AC Delco filter and things would do well.  I think the fact that I change oil at 500 miles, then 1,500 and then again at 3k on new vehicles is the reason,  Knock on Wood! that we don't have any oil consumption.  If interested in trying AMSOIL, let me know, I can get you the best price.  

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On 10/4/2025 at 9:27 AM, OS RR said:

Thought the oil burning had been solved on the newer 6.6s?

It has. People  like to get in the weeds over something that's just not that damn complicated. 

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