My '95 had the original batt's until I sold it a couple of years ago. They were original Ford "silver" series batteries. I have a couple of Chev mechanic friends who swear by and buy the Motorcraft batteries for their GM's. When it comes time for batteries in my diesel it will be the Motorcraft ones for me...maybe "Gold: series if available. Always replace in pairs. Do you plug the block heater in at all, in the winter?