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Doc's Diesel

4.5 (123)

Doc's Diesel DEF Guard Diesel Exhaust Fluid Additive

Name: Doc's Diesel Doc's Diesel DEF Guard Diesel Exhaust Fluid Additive - Doc's Diesel DEF Guard Diesel Exhaust Fluid Additive
Brand: Doc's Diesel
SKU: 52856889704812
Price: 14.99 USD
Availability: InStock
Rating: 4.5217 (15 reviews)

4.5 (1,234)

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$14.99

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One time purchase

$14.99

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Color

Black

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Description

Doc’s Diesel DEF Guard Diesel Exhaust Fluid Additive: Stop DEF problems before they stop you. Doc’s DEF Guard Additive prevents and removes crystallization buildup to keep your SCR system clean and running strong. It breaks down deposits, p...

Reviews

4.5

23 ratings

How would you know

It’s a DEF Additive, in a 2024 Duramax with less than 16k on it. How would you know if it’s doing anything seeing I’ve never had a problem. I’m taking you at your word that it does everything it states

Ronald · May 23, 2026

def guard

i just put it into the tank, iam sure it will work fine. time will tell. i am happy with other products, so iam sure this will do what you say, thanks, jim

Jim · April 8, 2026

Great stuff

Conor · 14 days ago

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Doc's Diesel

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Description

Reviews

4.5

23 ratings

How would you know

Ronald · May 23, 2026

def guard

i just put it into the tank, iam sure it will work fine. time will tell. i am happy with other products, so iam sure this will do what you say, thanks, jim

Jim · April 8, 2026