Lubricants, Engine Oil, HD Lubes, Tip of the Month, Heavy Duty, ck-4, fa-4 Heavy-Duty Diesel Engine Oil – CK-4 & FA-4 - Doug's Tip of the Month Jun 12, 2024 8:30:00 AM Why use CK-4 or FA-4? CK-4 and FA-4 are the current Heavy-Duty Diesel Engine oil spec. Doug Vrooman Read More
