---
product_id: 575611116
title: "SAFECASTLE PRI-D Complete Diesel Treatment – Super Concentrated Diesel Fuel Additive Treats up to 256 Gallons, Helps Support Fuel Lubricity and Stability for Diesel Engines, 16 oz (1 Pack)"
brand: "safecastle"
price: "26274 Ft"
currency: HUF
in_stock: true
reviews_count: 8
category: "Safecastle"
url: https://www.desertcart.hu/products/575611116-safecastle-pri-d-complete-diesel-treatment-super-concentrated-diesel-fuel
store_origin: HU
region: Hungary
---

# Treats up to 256 gallons Reduces fuel pump wear by 45% Prolongs fuel storage life SAFECASTLE PRI-D Complete Diesel Treatment – Super Concentrated Diesel Fuel Additive Treats up to 256 Gallons, Helps Support Fuel Lubricity and Stability for Diesel Engines, 16 oz (1 Pack)

**Brand:** safecastle
**Price:** 26274 Ft
**Availability:** ✅ In Stock

## Summary

> ⛽ Keep your diesel fresh, your engine fierce, and your peace of mind unstoppable!

## Quick Answers

- **What is this?** SAFECASTLE PRI-D Complete Diesel Treatment – Super Concentrated Diesel Fuel Additive Treats up to 256 Gallons, Helps Support Fuel Lubricity and Stability for Diesel Engines, 16 oz (1 Pack) by safecastle
- **How much does it cost?** 26274 Ft with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/products/575611116-safecastle-pri-d-complete-diesel-treatment-super-concentrated-diesel-fuel)

## Best For

- safecastle enthusiasts

## Why This Product

- Trusted safecastle brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Fuel Freshness Restored:** Revive stored diesel to refinery-fresh quality and keep your emergency fuel ready when it counts.
- • **Sludge & Deposit Defense:** Keep tanks and fuel lines pristine—no slime, no sludge, just smooth running engines.
- • **Eco-Smart Emissions Control:** Lower carbon monoxide, hydrocarbons, and particulate matter for cleaner, greener diesel operation.
- • **Extended Equipment Lifespan:** Cut fuel pump wear by nearly half, slashing maintenance costs and downtime.
- • **Maximized Engine Performance:** Boost combustion efficiency with up to 4 bar peak firing pressure and reduced fuel consumption by 1%.

## Overview

SAFECASTLE PRI-D is a super concentrated diesel fuel additive designed to treat up to 256 gallons, enhancing fuel lubricity, stabilizing long-term storage, and restoring degraded diesel to refinery freshness. Proven to reduce fuel pump wear by up to 45%, improve combustion efficiency, and inhibit sludge buildup, PRI-D ensures peak engine performance and lower emissions—making it an essential for emergency preparedness and diesel engine longevity.

## Description

Emergency diesel fuel can degrade over time. Storing diesel fuel with PRI-D diesel treatment will prolong the storage time of your emergency fuel and can actually restore diesel to refinery freshness if needed. Power Research Inc PRI-D diesel treatment is ideal for emergency diesel fuel treatment. It increases the lubricity of your fuel, keeps tanks and fuel lines sludge free, and improves engine performance. For an emergency preparedness minded person, the value of PRI-D cannot be calculated. This diesel treatment product keeps fuel at peak stability levels and prevents fuel degradation during long-term storage. This is important because one of the most common failures of emergency equipment is bad fuel that has been stored too long. Another key benefit of PRI-D is extended life of fuel pumps. Due to the high lubricity of this additive, wear reduction on ULSD fuels can be reduced by up to 45 percent. This can really reduce maintenance costs. PRI-D reacts with fuel upon contact, providing greatly enhanced fuel lubricity & deposit control benefits demanded by today’s engines. The laboratory & field proven benefits are multiple: ● Peak firing pressure (pmax) is boosted as much as 4 bar ● Specific fuel consumption is reduced as much as one percent ● Carbon & fuel system deposits are inhibited ● Fuel injection pump wear is reduced as much as 45 percent ● Fuel stays fresh, ignition quality improved. Degraded fuels are restored. ● Tanks & fuel lines remain free of slime & sludge ● Carbon monoxide (CO), unburned hydrocarbons (HC) & particulate matter(PM) are significantly reduced Improved Performance, Maintenance, & Emissions Reductions– CARB/EPA & power plant testing verifies PRI-D capability to improve the combustion process for optimum, long-term engine performance & efficiency & emissions reduction.

Review: PRI-G works! - i have used PRI-G for years to treat stored fuel. It has always worked well. I also use PRI-D with the same good results.
Review: The only trustworthy fuel additive I will use. - This is a real fuel additive that isn't snake-oil medicine. It is used by the petroleum industry in their own storage systems. I use this to stabilize fuel in a generator. Every 14-months on the day, we fire it up to check the functionality - and every time it starts up and runs at full power without any issues. After the 1 hour runtime test, we drain and discard the old fuel for new...so I can't comment on how long this fuel additive will work beyond 14 months. Note - we do not use fuel with Alcohol mixed in. Before using this product, we constantly ran into fuel degradation problems. Generator is in an unregulated storage shed, so it gets hot/cold. No other fuel additive seemed to work.

## Features

- Emergency diesel fuel can degrade over time
- Storing diesel fuel with PRI-D diesel treatment will prolong the storage time of your emergency fuel and can actually restore diesel to refinery freshness if needed.
- Power Research Inc PRI-D diesel treatment is ideal for emergency diesel fuel treatment. It increases the lubricity of your fuel, keeps tanks and fuel lines sludge free, and improves engine performance.
- For an emergency preparedness minded person, the value of PRI-D cannot be calculated. This diesel treatment product keeps fuel at peak stability levels and prevents fuel degradation during long-term storage. This is important because one of the most common failures of emergency equipment is bad fuel that has been stored too long.
- Another key benefit of PRI-D is extended life of fuel pumps. Due to the high lubricity of this additive, wear reduction on ULSD fuels can be reduced by up to 45 percent. This can really reduce maintenance costs.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B096Y89G8F |
| Best Sellers Rank | #70,452 in Automotive ( See Top 100 in Automotive ) #108 in Diesel Additives |
| Brand | SAFECASTLE |
| Customer Reviews | 4.6 4.6 out of 5 stars (55) |
| Date First Available | June 10, 2021 |
| Item Weight | 1 pounds |
| Manufacturer | Pri |
| Manufacturer Part Number | Pri-d |
| Package Dimensions | 7.09 x 4.33 x 2.13 inches |

## Images

![SAFECASTLE PRI-D Complete Diesel Treatment – Super Concentrated Diesel Fuel Additive Treats up to 256 Gallons, Helps Support Fuel Lubricity and Stability for Diesel Engines, 16 oz (1 Pack) - Image 1](https://m.media-amazon.com/images/I/61NpAUzZ7VS.jpg)
![SAFECASTLE PRI-D Complete Diesel Treatment – Super Concentrated Diesel Fuel Additive Treats up to 256 Gallons, Helps Support Fuel Lubricity and Stability for Diesel Engines, 16 oz (1 Pack) - Image 2](https://m.media-amazon.com/images/I/71-WgqPU3wL.jpg)
![SAFECASTLE PRI-D Complete Diesel Treatment – Super Concentrated Diesel Fuel Additive Treats up to 256 Gallons, Helps Support Fuel Lubricity and Stability for Diesel Engines, 16 oz (1 Pack) - Image 3](https://m.media-amazon.com/images/I/81A2KfyTcfL.jpg)
![SAFECASTLE PRI-D Complete Diesel Treatment – Super Concentrated Diesel Fuel Additive Treats up to 256 Gallons, Helps Support Fuel Lubricity and Stability for Diesel Engines, 16 oz (1 Pack) - Image 4](https://m.media-amazon.com/images/I/81DxGSx2T6L.jpg)
![SAFECASTLE PRI-D Complete Diesel Treatment – Super Concentrated Diesel Fuel Additive Treats up to 256 Gallons, Helps Support Fuel Lubricity and Stability for Diesel Engines, 16 oz (1 Pack) - Image 5](https://m.media-amazon.com/images/I/81Ev0X9nIGL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ PRI-G works!
*by C***S on November 25, 2025*

i have used PRI-G for years to treat stored fuel. It has always worked well. I also use PRI-D with the same good results.

### ⭐⭐⭐⭐⭐ The only trustworthy fuel additive I will use.
*by S***S on March 30, 2025*

This is a real fuel additive that isn't snake-oil medicine. It is used by the petroleum industry in their own storage systems. I use this to stabilize fuel in a generator. Every 14-months on the day, we fire it up to check the functionality - and every time it starts up and runs at full power without any issues. After the 1 hour runtime test, we drain and discard the old fuel for new...so I can't comment on how long this fuel additive will work beyond 14 months. Note - we do not use fuel with Alcohol mixed in. Before using this product, we constantly ran into fuel degradation problems. Generator is in an unregulated storage shed, so it gets hot/cold. No other fuel additive seemed to work.

### ⭐⭐⭐⭐⭐ Best fuel preservative on the market
*by T***S on December 16, 2025*

I've used PRI-G in my boat fuel, generator fuel, and to treat the gas cans for my ZTR lawnmowers and Stihl Chainsaws, for YEARS.. it's never let me down, NOT ONCE!

## Frequently Bought Together

- SAFECASTLE PRI-D Fuel Diesel Treatment for Lubricity & Stability Improved Performance, Maintenance, and Emissions Reductions, Maximum Lubricity Protection, Super Concentrated & Safe (16 Oz (1 Pack))
- PRI CP123 G Gasoline Treatment - 16 oz.
- SUPER CONCENTRATED PRI-G COMPLETE GASOLINE TREATMENT for all engine types IDEAL for E-10 GASOLINE

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*Product available on Desertcart Hungary*
*Store origin: HU*
*Last updated: 2026-01-24*