Originally Posted By: gfh77665
I still think 0-20 or 5-20 for the northern tier and Canada, 5-30 for mid America, and 10-30 for the Gulf Coast, AZ and NM are the optimal weights. One size does not fit all. Houston, TX and Fargo, ND have vastly different climates.
And xw-20 works well in both.
I was weary about using xw-20, but after seeing all the evidence here of excellent results in multiple climates and conditions with many different name brands, I have no problems using it in an engine spec'ed for it.