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Old 08-28-2013, 05:12 PM
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My '09 5.7L Ram Owners Manual reads
3,000 miles, but they are referring to Conventional 5w 20 Motor Oil
i use Synthetic 5w 20 & i like to run it to 5,000 miles

If you look at the year or 2 newer Dodge 5.7L manual, (identical engine), it reads 5,000 or 6,000 miles between changes, again that is for Conventional Oil

Now the 2013s say to use the same oil & i believe it reads 8,000 miles between changes & it is still the same engine block

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in reference to AIRCRAFT engines
they don't use Automotive Engine Oil, it has too many or the wrong additives
when a Aircraft Engine fails for any reason, they can't just pull over to the side of the road & call a tow service

our auto motor oil would make the Carbon Deposits GLOW & cause pre_ignition & premature wear

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taken from an Aviation website

These additives are designed to help prevent carbon deposits in the combustion chambers that will glow under normal operation.

That's the ashless part.
The dispersant are the detergents, that help suspend contaminants in the oil, so they may be swept out at oil change time.

It is my understanding that extended use of automotive oils in A/C engines may cause a build up of carbon deposits in the combustion chambers that are prone to glowing under heat, like a glow plug.

These glowing embers will help pre-ignition of the intake charge, and detonation symptoms may set in because of it.

Av-oils will also leave carbon deposits, but they are less prone to glowing, and less likely to cause detonation.
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