---
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)"
price: "$87"
currency: NZD
in_stock: true
reviews_count: 8
url: https://www.desertcart.nz/products/575611116-safecastle-pri-d-complete-diesel-treatment-super-concentrated-diesel-fuel
store_origin: NZ
region: New Zealand
---

# 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)

**Price:** $87
**Availability:** ✅ In Stock

## Summary

> ⛽ Keep your diesel fresh, your engine fierce, and your emergency ready!

## 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)
- **How much does it cost?** $87 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/575611116-safecastle-pri-d-complete-diesel-treatment-super-concentrated-diesel-fuel)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Extended Equipment Life:** Reduces wear on fuel injection pumps by up to 45%, slashing maintenance costs and boosting reliability.
- • **Fuel Freshness Restored:** Transforms degraded diesel back to refinery-fresh quality, ensuring peak engine performance when it matters most.
- • **Sludge & Deposit Defense:** Keeps tanks and fuel lines clean and sludge-free, preventing costly maintenance and downtime.
- • **Super Concentrated Power:** One 16 oz bottle treats a massive 256 gallons of diesel fuel, maximizing value and convenience.
- • **Cleaner, More Efficient Combustion:** Improves ignition quality and lowers emissions of CO, hydrocarbons, and particulates for a greener, smoother ride.

## Overview

SAFECASTLE PRI-D is a super concentrated diesel fuel additive designed to treat up to 256 gallons per 16 oz bottle. It prolongs fuel storage life by preventing degradation and restoring fuel to refinery freshness. By enhancing fuel lubricity, it reduces fuel pump wear by up to 45%, keeps tanks and lines sludge-free, and improves engine performance and emissions. Ideal for emergency preparedness and long-term diesel maintenance, PRI-D ensures your diesel engines run cleaner, longer, and more efficiently.

## 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: Best fuel preservative on the market - 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!
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.

## 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 | #26,432 in Automotive ( See Top 100 in Automotive ) #65 in Diesel Additives |
| Brand | SAFECASTLE |
| Customer Reviews | 4.6 4.6 out of 5 stars (56) |
| 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)

## Available Options

This product comes in different **Size, Flavor** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 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!

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ that is actually works to refresh fuel
*by T***K on November 6, 2025*

As advertised

## 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 New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-13*