5w-40 European oil in a 2.9?

[Nez'sRanger]

Has anyone run 5w-40 European car oil in a 2.9? I'm currently running standard 10w-40 in mine, but the idea of 5w for cold starts sounds nice especially for winter. 40 weight seems to shut up the ticking nice.
Any reason not to? Thanks!

 

[gw33gp]

I am running European 5W-40 synthetic in my 4.0 SOHC with no issues so far, but I have only been doing that since two oil changes ago.

I ran 20W-50 synthetic in my 2.9 for the whole time I had it which was almost 200K miles. Being in SoCal, I didn't have to be concerned about cold starts so much. When I did go to the mountains in the cold a few times, cold start was sluggish but always started. That oil was great for towing across our hot desserts.

The only negative thing I have heard of with the European 5W-40 is it used a higher amount of additives that can foul the catalytic converters. If you are not burning excessive oil, you should be fine.

 

[19Walt93]

I'd run 5w30 or 10w30, 10w40 doesn't have the updated additives because the OEMs discontinued it long ago. In cold weather 20w50 would be like trying to pump jello.