WSS vs ESE Coolant - Ford Powerstroke Diesel Forum
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post #1 of 1 Old 01-15-2012, 11:36 PM Thread Starter
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Question WSS vs ESE Coolant

G'day Fellas,

My truck is an Aussie 2005 7.3Ltr Powerstroke.
It is essentially the US 2003 7.3Ltr. Australia wasn't a signatory to the Cal Emmission laws so continued to plant the 7.3Ltr donks into our RHD F-Trucks up until late 2005.
My truck wasn't registered until February 2006.
The International 7.3Ltr donk in mine was manufactured in 2004.

The manual which came with the truck states that the correct coolant is WSS M97B44A. It is Green and requires the FW-16 Conditioner added at intervals during the coolant's lifecycle.
However I can only find compatable Green M97B44A Coolant prefixed with ESE (ESE M97B44A).
Can anyone enlighten me as to what (if any) difference is there between M97B44A Coolant prefixed WSS as opposed to ESE ?? What do the prefixes actually mean??.
Also the last letter can be a different one, A, D etc. What do they mean?


“Political correctness is a doctrine fostered by and illogical and irrational minority, who hold forth the proposition that it, is entirely possible to pick up a turd by the clean end”

Aussie spec Brazilian built 2005 (US 2003) F-250 Superduty 4x4 7.3Ltr Powerstroke: PHP FU2 Chip,6xISSPRO Guages,AIS Intake,Zoodad, Cowl Hood, AIH Delete, DIY CCV, BTM muffler, MBRP Black Tip, RiffRaff FRx,HPx, JWVB, ARB Air Lockers Front & Rear, V10 Tranny Cooler + Stock cooler, Deep Tranny Pan, ARB Bull Bar, Edge Evo (PID & Codes only), Long Range Fuel Tank, VMS in Dash GPS Street & Off Road Nav, Toyo OPAT AT 305 70R 16”on 10” Rims, HD Suspension & Leveling Spring.GVWR 5,000Kg.
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