X2

the w rating for winter is the viscosity when it's cold..putting a 10w oil will be thicker during winter startups and will take longer to reach your valves and associated valvetrain causing ticking and longer dry starts...i'm in upstate ny and it gets pretty cold here and I will never run 10w 30 during winter...I would just stick with 5w 30..imo.

 

5W30 for winter here as well. 10W30 will do no harm to your engine in the short term in the winter time, but as was mentioned, it will take longer to warm up and become thin enough to get to all the internal parts of your engine. It's funny you had to 'convince' your mechanic on the oil weight when he should know that it will be fine. I'm guess he is just worried because you still have such low mileage. It's not like you asked him for 90W gear oil.

 

Has anyone spoken to a Chrysler Engineer to find out exactly why they are now using 5w20? Rather than just guessing.

I plan on running 5w20 until Chrysler says not to or its ok to run 5w30 on a regular basis.

 

What sold me on using 5w-30 is that apparently European JK's recommend this. Apparently it is 5w-20 here in the States to help meet CAFE standards. Sacrificing long term reliability in the name of short-term MPG - another unintended consequence of government regulation!

 

As soon as I went to a 5w30, the engine quieted noticeably (Quaker State Enhanced Durability). Also, I used to get a very small amount of oil loss between changes, and that has gone down to zero now.

Soon as the cold weather hits, I be watching/listening carefully for any signs of starvation, but I figure a 5w30 should not be any thicker than a 5w20 at lower temps. We'll see.

Grant

 

Yes 5w20 is a thinner oil which means less internal resistance which is meant to improve economy and unless you live where it is very cold it gives less protection for the motor and a shorter lifespan

 

What about the warrenty? Will Chrysler cover repairs if you have been running 10w30? Although I like to run 10W30 I will run 5W20 until my warrenty is up.

 

From what I've witness they won't be able to tell unless you admit changing to a different weight oil...now that being said i'm sure there are ways to test the viscosity of the oil in the engine, but I don't think they would go to all that trouble.but it is a slight risk...personally I think 5w20 is way to thin especially for how hot these motors run...if you ever wanted to change oil type stick with a 5w oil...you want the thin oil when it's cold and on start up so I wouldn't use 10w oil...you can go up in thickens on the second number ie: you can use5w20(recommended oil for this motor) or5w30 but stay away from 10w...now if it's a hot summer and all you can find is 10w30 and you will be changing oil before the winter you could get away with it but you may experience some dry starting and ticking until she warms up

 

The film strength of either one will be the same so wear isn't a consideration. The 5w-30 will have engine components "dragging" through the thicker oil than the thinner one (5w-20) but will not alter protection. The 10w-30 will
take a bit more time to get started through the engine and it may or may not affect engine wear depending on temperature and crank time before the engine starts. The oil pump pushes oil through the system as soon as it starts moving...during cranking...so the 10w should be OK as well, but if you use 10w it's a double-whammy when it's cold out. You'll be fine with the 5w-30 but you'd be better off with the 5w-20.

 

I have been running 5 W 30 Mobil 1 for over 50,000 miles still runs great! The on type and weight I will use.