A couple of months ago, following the untimely demise of my '08 6.4L F250, I bought a new 2011 6.7L PSD F350. It seemed strange to me that this engine specs 10w30 for most use, and 15w40 only for high temperature towing.
I was planning on changing the oil in December with 5w40 because it will be getting below zero frequently this winter. Here are the recommended grades for this engine:
Just two weeks ago the turbo had to be replaced, and they changed the oil as part of the procedure. I don't want to dump out fresh oil with only a few miles on it, but I also don't want to damage my engine. Should I switch to 5w40? Or will the fresh 10w30 do okay this winter?
I was planning on changing the oil in December with 5w40 because it will be getting below zero frequently this winter. Here are the recommended grades for this engine:
Just two weeks ago the turbo had to be replaced, and they changed the oil as part of the procedure. I don't want to dump out fresh oil with only a few miles on it, but I also don't want to damage my engine. Should I switch to 5w40? Or will the fresh 10w30 do okay this winter?