Will this give good protection against electrolysis in the international 6.9 diesel?

First check whether you are experiencing chemical and or stray voltage electrolysis. Get PH test strips to see if your coolant is acidic. Take your volt/ohm meter and test for stray (DC) voltage in your coolant. With the 6.9 international you should be doing more frequent cooling flushes and replacements. The VC-8 is an additive used based upon nitrate test strip results. It replenishes nitrate breakdown in coolant or adds to coolant to achieve a proper nitrate level. A simple inline coolant filter installed on the heater hose is helpful to trap metal degradation migration. A multi prong approach is needed to protect your 6.9.

So is this what I need for my 2015 6.7 powerstroke

I have a 2011 6.7 with the “coolant additive” displayed….used this bottle and nothing changed. I’m going to see if the sensor is dirty next.

Can this be mixed with VC12?

I use the VC8 with old school green anti freeze. I do know if you can use it with the VC12/ gold? I would check the specs of VC12

Ford 7.3 L IDI, will be flushing the radiator and changing the coolant. About how many bottles should I buy?

If you are changing the coolant, just purchase coolant with the additive already in it. If you are intent to use standard antifreeze, it will take four bottles of the VC-8 to get you in the protected range according to test strips. Once you have established protection, test your antifreeze yearly with test strips and ad VC-8 if needed.

Genuine Fluid Vc 8 Diesel Cooling System Additive 16

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Description

❄️ Keep your diesel cool, your engine loyal.

TRUSTED OEM QUALITY - Genuine Ford product with a 4.8-star rating from 446 users—reliability you can count on.
PROLONGS COOLANT LIFE - Designed to replenish additives lost between coolant changes, extending system protection and performance.
NO MORE COLOR CONFUSION - Yellow dye prevents engine coolant color changes when mixing, eliminating guesswork and potential errors.
ENGINEERED FOR HEAVY DUTY DIESEL - Optimized to maintain peak cooling in demanding diesel engines, even under mountain-pulling stress.
DUAL FORD SPECIFICATION COMPLIANCE - Replaces both fluorescent green V119 and Motorcraft gold antifreeze, ensuring flawless compatibility.

The Genuine Fluid VC-8 Diesel Cooling System Additive is a Ford OEM-approved solution designed to replace depleted additives in heavy-duty diesel engine cooling systems. Compatible with both fluorescent green V119 and Motorcraft gold antifreeze, it features a yellow dye to prevent color changes when mixing. Trusted by professionals and backed by a 4.8-star rating, it ensures optimal cooling performance and system longevity.

Specifications

ASIN	B000NU3LPS
Brand	Ford
Customer Reviews	4.8 4.8 out of 5 stars (446)
Date First Available	5 September 2013
Exterior	Smooth
Item Weight	227 g
Item model number	VC-8
Manufacturer	Ford
Manufacturer Part Number	VC-8
Model	VC-8
OEM Part Number	VC8
Product Dimensions	20.07 x 5.84 x 5.08 cm; 226.8 g

Reviews

A**R

correct stuff

28.09.2025

C**3

Works great and lowered the water temperature tremendously while pulling trailers up mountains. Use the test strips to get it to the right mixture

23.09.2024

M**A

Great for the ford diesel

27.06.2025

C**A

Gant beat Motorcraft genuine products. I've used this for years, adding between coolant changes. Keeps the cooling system healthy and ready for towing here in TX. Highly recommended!

26.08.2024

P**T

14.06.2021

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