Originally Posted By: LargeCarManX2
True....way too much silicates for a diesel. You need a diesel low silicate antifreeze. I would buy a pre-mixed Cat brand diesel coolant or a low silicate antifreeze with Fleetguard diesel coolant additive.
Go to a LARGECAR dealer such as Peterbilt, Kenworth, or Freightliner...etc...etc.
I don't know why you say that, from here:
http://www.prestone.com/carcare/faq.php
Prestone® Extended Life 5/150 Antifreeze/Coolant is phosphate, silicate, and borate free.
Same page says it meets all of the relevant Ford specifications,
M97B44-A , B, and D. Sounds like it pretty much is very similar to the Ford gold coolant, a G-05.
To the original poster, do not put an SCA in this coolant.