I would think that unless you live in or around the arctic circle 10w 40.
 
Basically all moderner cars are 5/30 anything old is 10/40 as a rule of thumb

I would never run 5w30 unless living in the artic. 10w40 summer= better cooling as it carry away heat better to the oil cooler and 10w 30 winter.got 300k on 1 engine petrol and 200k on a diesel and never did a thing to them other than 6k between oil changes.Some times that was every 6 weeks. fuel filter once a year and air filter once a year that is it. I really laugh at how you all have hgf and cooling issue with you cars. just un real.
 
I would never run 5w30 unless living in the artic. 10w40 summer= better cooling as it carry away heat better to the oil cooler and 10w 30 winter.got 300k on 1 engine petrol and 200k on a diesel and never did a thing to them other than 6k between oil changes.Some times that was every 6 weeks. fuel filter once a year and air filter once a year that is it. I really laugh at how you all have hgf and cooling issue with you cars. just un real.

Well thats what I've always been told/dime at garage i work at. And thats pretty much what it says in the carlube book
 
5W-30 remember your 3.0L has a DpF and the it must be a C1 spec, this means low ash and helps the DpF not clog up to fast.
 

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