2500 miles or 3 months oil change

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This what an 18 Jeep 3.6 looks like with regular unleaded i.e broken ring land and carbon buildup. The video also shows that anyhow the top end looks clean, sludge is still present.

 
I've found 5k/6 month (whichever comes first) OCI is the sweet spot with most vehicles.
I personally prefer to only use Dexos 1 Gen 3 Full Synthetic High Mileage oil (to treat oil seals as well to prevent future oil leaks).

This interval and oil prevents sludge/varnish buildup.

Some things which convinced me this this is the right interval:
A few videos on youtube about "Million mile Joe", who owned an early 1990's Honda Accord since new and took it to 1,000,000 miles doing oil changes about every 5,400 miles.

Also there is another video about a husband/wife traveling performers in the south who took a 1990's era Honda Civic hatchback to 500,000 miles doing oil changes every 5,000 miles.
I would think that engine design has a lot to do with an engine longevity - along with good maintenance practices (timely oil & filter changes) . Conversely , if you have a poor engine design - then timely oil and filter changes alone will not help your engine reach 300K+ miles .
 
No need to do an oil analysis unless you are either overextending your OCI or you feel there's an oil issue under the hood, or at / out the exhaust..
 
NO! Or at least be very cautious going that route. For a period I did a lot of serious off roading, and I did a lot with a group of regulars. Among that group, several used those valves (myself included), and in a couple of instances the rough terrain got in the way of the valve. In most instances in such terrain a spotter was used, and it could be seen by the observer that the valve was a point of impact with the ground. In one instance the valve was ripped out of the oil pan ... damage followed. Knowing that, and seeing the issue first hand, I stopped using the valve. YMMV, but be cautious.
My 5.3L’s have them - Jeep, no way - Lexus = too low.
 
This what an 18 Jeep 3.6 looks like with regular unleaded i.e broken ring land and carbon buildup. The video also shows that anyhow the top end looks clean, sludge is still present.


Purely mechanical design flaws and tuning issues. No amount of “holy grail” oil or other fluids will save bad designs. I personally stay away from Stellantis/Gm products for this very reason.
 
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