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When I picked my JKU up a few weeks ago, I made an appt to get my first complementary oil change done. I was talking to the service adviser and asked him if the use dino or syn oil. He said that synthetic was not recommended because it would force higher compression inside the engine. Ive never heard of such a thing. Is there anything to this?
 

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If this made a difference then there would be something seriously wrong with your rings :)
 

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Dynamic compression ratio (the one that really matters) is derrived from the distance between the piston position during the compression stroke when the intake valve(s) are very close to seated (cant remember the standard distance used) when compression can actually begin to occur, and the piston at top dead center.. obviously this has nothing to do with the type of oil
 

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Go by your owners Manuel. It will spell it out there is you can't use it. For the life of me I can't see why you couldn't.
 

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Page 520 of the 2012 JKU Manual
Synthetic Engine Oils​
Synthetic engine oils can be used if the recommended oil
quality requirements are met, and the recommended
maintenance intervals for oil and filter changes are​
followed.
 

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That's why its free.

Me and my friends do our own oil changes in all our cars because we don't trust them, expecially the dealers. We use sythetics on all. When we changed the oil for the first time in our '11 Wranglers, everyone of them (4 of them) had only 5 quarts of oil in them (actually, one of them had just barely over 4) even though the specs call for 6 quarts....Chrysler trying to save a few bucks here by skimping out on a quart of oil per vehicle????? :whistling:

I don't think this is a coincidence. One of our friends got his Acura (yeah, it's not a Jeep, but it's to prove a point) oil change done by the dealer....he drained the oil a week later and what do you know...1 quart short again.

I guess 1 quart saved per vehicle, and it adds up to $$$$ saved for the dealer. That's why I won't go to a dealer, even if it's free.
 

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"because it would force higher compression inside the engine"

aha.....
ahahahahahahaha.......

HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA!!!!!!!!!!!!
......................
BWAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!111!!11!!ONE
 

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Mobile 1, baby.

Mobile 1
Or Amsoil if you want to blow a couple more bucks. I prefer Mobil1 , but I do remember a time when Amsoil seemed like the only oil that quieted down one of my old explorers. Good oil, just pricey.

Oh yeah, that whole BS about the compression is just ignorance on the part of the stealership. I was told the Rubicon was no different than the sahara, just writing on the fender. :rofl:
 

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If you have to pay for your next oil change, I guarantee the dealer will not say that engine won't take Synthetic! they may even recommend it on that second visit!
 
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