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Hopefully someone can answer this. I had a 2012 Jeep and a 2012 Dodge journey, both with the 3.6l engine and the recommended oil was 5W-30. I now have a 2013 Doddge Durango, same engine, and the recommended oil is now 5W-20. When I was at my dealer recently, I took a look at the 2014 Durang...

My new Durango with the 3.6 V6 pentastar engine calls for 5w-20. In 2012 it called for 5w-30. Why the big change in one model year? Is it actually required for some internal change in the engine, or is it to satisfy CAFE? I have heard it is for the valve train? Can anyone shed some truth on this?

it's mighty cold here in Michigan, and it seems like the 3.5 liter V-6 doesn't turn over real good with the factory spec'd 10W-30 in the crankcase. Would it be OK to use a lower viscosity oil for the next oil change? Anyone see a problem? Thanks in advance for any replies.

Does anyone see a problem with mixing Valvoline 10W-30 synthetic with Valvoline 10W-30 dino? Have a stash I would like to use up. For a '99 Dodge Journey 3.5L V-6. Replies would be welcome and appreciated.

Would it do any harm to change from a steady diet of synthetic to semi- synthetic or dino in my 3.5 liter dodge journey? The engine has about 20,000 on it. Thinking of doing this to save a few bucks. Replies/advice is welcome/ Thanks

I recently bought a new Jeep Liberty with the 3.7L V-6 engine and I noticed on the oil filler cap and in the owners manual that this motor is now spec'd for 5W-20. I had two '07 Jeep Grand Cherokees with the exact same motor and they were spec'd for 5W-30. Is this strictly the result of CAFE or...