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Hi to All,
I am going to change coolant in my '03 F 150/5.4.
I bought some Zerex several years ago to top off my radiator. It has the WSS M97B51-A1 number that Ford specifies in the owers manual. This is the 5 yr orange antifreeze.
I haven't been able to find anything with that number on the container.
I see the number WSS 97B44B or D.
My question is what 5 year antifreeze should I use? So far I haven't been able to find any Zerex.
Thanks,
Ned
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