50000 Miles or 5 Years
The replacement intervals is listed in your owners manual.
Some state the first change is @ 100K miles and every 50K or 3 years after the initial change.
The coolant must meet WSS-M97B51-A1 Ford spec.
The type of coolant to use on a Ford 7.3 diesel is Motorcraft Premium Gold Engine Coolant. Motorcraft Gold provides optimal protection for the engine.
Motorcraft Premium Engine Coolant ( green color ) or Motorcraft Premium Gold Engine Coolant ( yellow color ) Use the color that came in your vehicle or is in it now
Motorcraft Premium Gold Engine Coolant (yellow coolant)
You can use standard GREEN coolant in this system.DO NOT use orange or DEX COOL coolant.It will not mix with your current coolant.
According to the Owner Guide , from the factory it came with either : Motorcraft Premium Engine Coolant ( green - color ) Ford specification ESE-M97B44-A or Motorcraft Premium Gold Engine Coolant ( yellow - color ) Ford specification WSS-M97B51-A1 . Check the engine coolant reservoir . It is a 50 / 50 mix of coolant and distilled water from the factory
Motorcraft Premium Gold Engine coolant (yellow colored) or similar but must be yellow
I was looking at the 2002 Ford F-150 Owner Guide and it ORIGINALLY came with either the : Motorcraft Premium engine coolant ( green - colored ) meeting Ford specification ( ESE - M97B44 - A ) or Motorcraft Premium Gold engine coolant ( yellow - colored ) meeting Ford specification ( WSS - M97B51 - A1 ) What color is in your engine coolant reservoir ?
Motorcraft Premium Gold Coolant- dealer only item
You can use Motorcraft Premium Gold Coolant in your 2003 Cobra SVT. You can also use the green version of this coolant.
The Owner Guide shows Motorcraft Premium Gold Engine Coolant ( yellow-colored ) Ford specification ( WSS-M97B51-A1 ) But also shows to add the coolant that was originally in your vehicle
From Haynes Manual #36071, 1993-2005 Ford Ranger Pick-ups: Recommended coolant type: 50/50 mixture of Motorcraft Premium Engine Coolant (green colored) or Motorcraft Premium Gold Engine Coolant (yellow colored), or equivalent. The manual does not specify a particular color for a particular model Ranger. You might want to check the label under the hood to see if there is a preference for your vehicle. There are 50/50 mixtures on the market that will mix with either color.
According to the 2008 Ford Escape Owner Guide : Motorcraft Premium Gold Engine Coolant with bittering agent ( yellow colored ) meeting Ford Specification ( WSS-M97B51-A1 )