Originally Posted by zed
I started using the 15-40 this year. My friend gave me a couple gallons because he was switching over to synthetic.
The 15w40 is a mineral oil, NOT the synthetic that gets good reviews.
Blue bottle Rotella=good synthetic
White bottle=average diesel mineral oil
In Canuckistan look for Esso XD-3 @ Wal-mart. $23 for a full synthetic PAO IV, best deal going on oil north of the border.