Originally Posted by
Ian123
I'm under warranty for another month so I have to stick with Ford coolant. Even after the warranty I think I will keep it. 71K miles on my rig and I've never seen the eot/ect delta more than 7 degrees.
You're very lucky! With warranty left, I would just buy a jug of 50/50 Zerex G-05 (same as Ford Gold) and call it good. Next time you're due for a coolant change though, I'd do a thorough flush and make the change. My dad's '03 has the original oil cooler and ELC coolant, I watch the delta as we pulled our John Deere up the mountain (about 14k with trailer) and the delta stayed under 7 degrees the whole way up. Have you checked yours under load?