I have a 15 Jku willys with the 3.6L engine and manual trans. In the morning when I start it there is a rattle for 1 - 2 seconds until the oil is picked up and then all is quiet. Only does this after sitting for a few hours.
My wife has a 15 Dodge journey with the same engine and it does not do this. Yes the oil is full and clean only 1300 miles on the jeep. Should I be concerned or is this fairly normal.
Mine doesn't do this. I would attempt to isolate the noise origination, document it, and then bring it to a dealer OR fix it yourself if it's something really simple.
Mine used to until I switched to Pennzoil Platinum 5w-30 synthetic. Now I don't hear it anymore. I was concerned about running it in the winter but even cold weather starts were quiet. I'm sold. I even put it in the truck on the last oil change.
Ours does it. I first noticed last year when we were on vacation. We went by the local FD and parked on an incline with the nose up. We were in there for about 20+ minutes and when I started the jeep it had the rattle on startup.
My new 3.6 does not do this, but my wife's mini cooper is notorious for doing it. Turned out to be the hydrolic timing chain tensioner. It needed to fill with oil on startup in order to tension the chain enough not to rattle around on the top pulleys. The fix from BMW was a longer chain tensioner to keep the timing chain tighter.
I'm not sure if our Pentastar engines have the same type of internal tensioner.
Maybe it depends on the climate where you live. I live in South Florida so it rarely gets below 60 degrees during winter.
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