---
product_id: 16110185
title: "Coolant System Conditioner 2 Pack - SOA635071 - Genuine OEM"
brand: "subaru"
price: "€ 19.19"
currency: EUR
in_stock: true
reviews_count: 5
category: "Subaru"
url: https://www.desertcart.ie/products/16110185-coolant-system-conditioner-2-pack-soa635071-genuine-oem
store_origin: IE
region: Ireland
---

# Fits 1990-2008 Subaru models Genuine OEM formula Prevents small head gasket leaks Coolant System Conditioner 2 Pack - SOA635071 - Genuine OEM

**Brand:** subaru
**Price:** € 19.19
**Availability:** ✅ In Stock

## Summary

> 🛠️ Keep your Subaru leak-free and race-ready—because your ride deserves genuine care!

## Quick Answers

- **What is this?** Coolant System Conditioner 2 Pack - SOA635071 - Genuine OEM by subaru
- **How much does it cost?** € 19.19 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/16110185-coolant-system-conditioner-2-pack-soa635071-genuine-oem)

## Best For

- subaru enthusiasts

## Why This Product

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

## Key Features

- • **Extended Engine Life:** Helps extend the lifespan of head gaskets by preventing and temporarily sealing small leaks.
- • **Dual-Pack Convenience:** Two bottles included for multiple treatments or sharing with fellow Subaru enthusiasts—never run out when you need it most.
- • **Cost-Saving Maintenance:** A smart, budget-friendly alternative to costly repairs—proven to reduce coolant leaks and avoid expensive head gasket replacements.
- • **Subaru-Approved Performance:** Engineered specifically for Subaru’s green coolant systems to ensure optimal compatibility and protection.
- • **Trusted by Mechanics & Racers:** Recommended by professionals and racers alike, delivering reliable results that keep your engine running smoothly.

## Overview

The Subaru Coolant System Conditioner 2 Pack (SOA635071) is a genuine OEM additive designed exclusively for Subaru vehicles using green coolant from 1990 to 2008. It helps prevent and temporarily seal small head gasket leaks, extending engine life and saving costly repairs. Trusted by mechanics and racers, this conditioner is an essential maintenance product for Subaru owners aiming to protect their investment and maintain peak performance.

## Description

Genuine Subaru Coolant Conditioner. Good idea to use on your Subaru when you do a coolant flush. This will help the extend the head gaskets. Used only with cars with green coolant. Your package will include the following items: Subaru Genuine Coolant Cond. SOA635071 x2. Don't settle for aftermarket components of questionable quality and always insist on Genuine Subaru replacements. Fits: 1993-2008 Impreza Wrx STI 1998-2008 Forester 1990-2008 Legacy and Outback

Review: safe, effective, temporary fix for small leaks/prevention - I am very skeptical about miracle in a bottle like "liquid engine rebuilder" but this is a product designed and recommended by subaru for subaru's, specifically for preventing and treating small head gasket leaks. That said, I do have a small/moderate external head gasket leak of about 100cc per 1000 miles. I can't pull the engine and replace the head gaskets right now and 2 bottles of this have dramatically reduced the leakage, much to my surprise. This is not a permanent fix but I would highly recommend it to be added when changing your coolant or if you ever notice a significant drop in coolant in one of these subaru boxer motors. If you have a known coolant leak you are on borrowed time even with this product and more significantly you are in danger of serious engine problems if not addressed. You need to monitor your engine oil regularly (daily/weekly) and if it looks milky or in any way just not normal you need to get those heads done immediately. Also, you need to watch your engine temp like a hawk and if it never goes above half way, such as mine, and then one day it is 3/4 to the top, not in the red mind you, but just a significant deviation from normal, you need stop get those heads addressed immediately. Head gaskets leaks can be tricky and if it is only an external leak (big if) you aren't in real danger of damaging your engine, but coolant to oil, or combustion to coolant leaks are emergent situations in my book. That said, I'll use this again as it did work for me, again, as a temporary fix till I get the head gaskets done.
Review: WOW! - I purchased this coolant conditioner suggested by a local mechanic for a heater core leak in my 2001 Jeep Grand Cherokee 4.0. I was having to fill my reservoir tank 2 to 3 times a week. I had a permanent wet spot in my driveway. Went to this reputable local mechanic and as he charged strictly by the book hours to replace my heater core, cost to repair was going to be $450. After turning down his estimate and deciding to live with the problem, he offered information about this coolant conditioner that he used in a dragster he owned and raced. I purchased the two bottles and installed it as per YouTube videos and within 2 days my leak was stopped and has not returned for a year now (knock on wood). I only used one bottle for my fix so I gave the other bottle to a friend that had a leaky system on a farm tractor and bam it fixed that also. GREAT STUFF! saved me $442 in repairs. Highly recommended!

## Features

- Used only with cars with green coolant
- Subaru Genuine Coolant Conditioner SOA635071 x2
- 1993-2008 Impreza WRX STi
- 1998-2008 Forester
- 1990-2008 Legacy and Outback

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00WFI0W2Q |
| Best Sellers Rank | #70,820 in Automotive ( See Top 100 in Automotive ) #62 in Automotive Replacement Engine Coolant Recovery Kits |
| Brand | Subaru |
| Customer Reviews | 4.6 4.6 out of 5 stars (679) |
| Date First Available | April 20, 2015 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 9.9 ounces |
| Item model number | SOA635071 |
| Manufacturer | Subaru |
| Manufacturer Part Number | SOA635071 |
| Package Dimensions | 4.76 x 2.48 x 2.44 inches |

## Images

![Coolant System Conditioner 2 Pack - SOA635071 - Genuine OEM - Image 1](https://m.media-amazon.com/images/I/51hkBseQe3L.jpg)

## Questions & Answers

**Q: should i use this in my 2011 forester that has no leaks at 160000 miles just for insurance?**
A: I used it in my 2011 Forester per user manual around 130k with the coolant drain and change (did not flush or change thermostat). Now at 155k I havent had any problems (or headgasket leaks as the dealer informed me). The Radiator is old and cracking now so I would replace that all together this time along with water pump.

**Q: Do I use both bottles or just 1**
A: Some Subaru models are notorious for head gasket issues. Subaru developed this additive with Holts to prevent problems from faulty head gaskets. Use one of these every time you do you your 30,000 miles coolant flush. If adding it before your next flush, just remove 4oz from your radiator (when cool). It is a brown goupy solution with chunks, you must shake VERY well before pouring. Some owners swear by this stuff, some are mad they have to use it in the first place, and some put it in and forget it. Recently has seen widespread use in non-Subaru makes because of it's excellent performance compared to other Stop Leak products. If your car is showing signs of head gasket issues, it is advised to try this out, and then use it with every coolant flush. Other head gasket failure preventions: - Make sure your battery terminals are corrosion free

**Q: Can I use this in turbocharged engine?**
A: Most places online say it wasn't meant for turbo models. That doesn't necessarily mean it won't work if you have a coolant leak. It's a rebranded product made a British Company called Holts. The Holts product name is Radweld. Subaru rebranded it for use in a recall of 99-2002 ej25 models with weak head gasket material. Those are not turbo model engines, but the turbo models weren't recalled for it, if that helps. If you have a coolant leak, it's worth a try. It's cheaper than replacing a head gasket.

**Q: Can this cooling system conditioner be used in vehicles other than subarus? or is it designed to be used only in subaru vehicles?**
A: any vehicle

## Customer Reviews

### ⭐⭐⭐⭐⭐ safe, effective, temporary fix for small leaks/prevention
*by W***R on November 19, 2018*

I am very skeptical about miracle in a bottle like "liquid engine rebuilder" but this is a product designed and recommended by subaru for subaru's, specifically for preventing and treating small head gasket leaks. That said, I do have a small/moderate external head gasket leak of about 100cc per 1000 miles. I can't pull the engine and replace the head gaskets right now and 2 bottles of this have dramatically reduced the leakage, much to my surprise. This is not a permanent fix but I would highly recommend it to be added when changing your coolant or if you ever notice a significant drop in coolant in one of these subaru boxer motors. If you have a known coolant leak you are on borrowed time even with this product and more significantly you are in danger of serious engine problems if not addressed. You need to monitor your engine oil regularly (daily/weekly) and if it looks milky or in any way just not normal you need to get those heads done immediately. Also, you need to watch your engine temp like a hawk and if it never goes above half way, such as mine, and then one day it is 3/4 to the top, not in the red mind you, but just a significant deviation from normal, you need stop get those heads addressed immediately. Head gaskets leaks can be tricky and if it is only an external leak (big if) you aren't in real danger of damaging your engine, but coolant to oil, or combustion to coolant leaks are emergent situations in my book. That said, I'll use this again as it did work for me, again, as a temporary fix till I get the head gaskets done.

### ⭐⭐⭐⭐⭐ WOW!
*by W***N on December 25, 2024*

I purchased this coolant conditioner suggested by a local mechanic for a heater core leak in my 2001 Jeep Grand Cherokee 4.0. I was having to fill my reservoir tank 2 to 3 times a week. I had a permanent wet spot in my driveway. Went to this reputable local mechanic and as he charged strictly by the book hours to replace my heater core, cost to repair was going to be $450. After turning down his estimate and deciding to live with the problem, he offered information about this coolant conditioner that he used in a dragster he owned and raced. I purchased the two bottles and installed it as per YouTube videos and within 2 days my leak was stopped and has not returned for a year now (knock on wood). I only used one bottle for my fix so I gave the other bottle to a friend that had a leaky system on a farm tractor and bam it fixed that also. GREAT STUFF! saved me $442 in repairs. Highly recommended!

### ⭐⭐⭐⭐⭐ So far so good
*by T***K on September 9, 2023*

So I drove a late 90s Subaru with an EJ25 diagonally across the continental U.S. with a partially bad head gasket. That is, my coolant was not mixing with oil, and my oil was not mixing with coolant. However, exhaust gases were getting into the coolant and escaping through the overflow tank, conversely causing coolant loss and confusing the thermostat. I had this confirmed using a test designed to detect exhaust gases. I've done a lot of work to this car and sometimes wonder if I am dedicated enough to fix the head gaskets. I can't afford that yet. But here's what I did. Changed both radiator hoses. Those aren't good after 30 years. This helped with the coolant loss, as far as I could tell, but I wasn't confident enough to drive it a long distance, because typically after getting off the interstate and idling at a light is when it starts to overheat, and in those scenarios (at least before changing the hose) i would need to add a good bit of water to it to top it off again. Anyway! Even if part of the problem was the old hoses - If bubbles are coming out through the radiator, then coolant is going into the exhaust system, and thus losing coolant, one could safely assume. So, I changed the hoses. I ran it for a few days with just water to make sure I wasn't losing expensive coolant. I didn't lose any. But I feel like it was somewhat therapeutic for the corrosion to do the complete drains + fills a few times over a few days, even with the water. Once I drained the water, I added a bit of coolant, then a bottle of this, and some more coolant, and then another bottle, and then some more coolant. My thought process was that, since air cavitation makes filling these radiators super slow as you wait for air bubbles to make room for more coolant (esp. if your "breather" nut is stripped like mine) then I will probably get more "coverage" with this magic paste if i "spread it out" over the entire fill-up. I took it for a little drive immediately, not wanting it all to settle to the bottom, and let the engine idle for a good 20 minutes when I got home. After idling - ECT was 185f - Perfect! I looked in the overflow tank - NO BUBBLES! My coolant smells like coolant, instead of exhaust gases! You'd think it was flammable the way it smelled before. So, I think this pour-in stop-leak knows what it's doing when it comes specifically to Subaru head gaskets which have failed in the way of containing exhaust gases, but I wouldn't bet on it if you are already getting coolant and oil mixing. I still plan to change the head gaskets , heads machined and get the valves reseated and everything. But this stuff + the results have given me new confidence in driving this thing longer distances in the meantime. Hopefully it's a relativey long term fix.

## Frequently Bought Together

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-02-25*