antifreeze question
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New User
Joined: Oct 2008
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antifreeze question
I just put a new waterpump, hoses and a thermostat in my 99 7.3 and i filled it up with regular preston antifreeze (not the 50/50) from walmart/ Is this the wrong antifreeze or will this be o.k. I live in the south (alabama)
Posting Guru
Joined: Jul 2006
Posts: 1,720
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I use Fleet (RED) antifreeze from NAPA for Mac, Cat. and it exceeds the Ford spec. The additive is included in it when you buy it.
Check your owners manual spec for what you bought to see if it meets the Ford spec. I would reco you stay with antifreeze that meets the Ford specs.
There is a difference between auto and diesel antifreeze due to the high compression ratios in the diesel.
Post Fiend
Joined: Feb 2008
Posts: 10,977
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From: Lancaster, Pa.
I hate saying this but I made the same mistake. You need to get that regular prestone out of there and flush it and put in an antifreeze that meets the specs of a diesel engine preferably an Extented Life Coolant(ELC) I used Cat 50-50 because they didn't have anything else at the moment. Fleetguard ELC is good too. Most truck stops got it, good luck.
Posting Guru
Joined: Jul 2006
Posts: 1,720
Likes: 1
I hate saying this but I made the same mistake. You need to get that regular prestone out of there and flush it and put in an antifreeze that meets the specs of a diesel engine preferably an Extented Life Coolant(ELC) I used Cat 50-50 because they didn't have anything else at the moment. Fleetguard ELC is good too. Most truck stops got it, good luck.
