M Merkava_4 Joined Jan 30, 2007 Messages 17,501 Location Clovis, CA Oct 16, 2011 #21 You can always do a UOA and if the copper and iron numbers are through the roof, you'll know not to run 5W-20 on the next OCI.
You can always do a UOA and if the copper and iron numbers are through the roof, you'll know not to run 5W-20 on the next OCI.