I think the pour point for the delvac is around -33f. Do you think this would be adequate cold weather flow. Or would the 5w-40 shell group 3 be better. The only delvac on the shelf at my local walmart is the 15w-40 but they do carry the rotella 5w-40. This would be used in a 350 vortec with 128000 miles. Here in West Virginia we can see temps. as low as -10 to -15f. Any help would be appreciated.