---
product_id: 11905714
title: "Genuine GM Fluid 88861803 Upper Engine and Fuel Injector Cleaner - 16 oz."
brand: "general motors"
price: "€ 99.42"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.nl/products/11905714-genuine-gm-fluid-88861803-upper-engine-and-fuel-injector-cleaner
store_origin: NL
region: Netherlands
---

# Low VOC compliant Immediate engine deposit cleaning 16 oz precision formula Genuine GM Fluid 88861803 Upper Engine and Fuel Injector Cleaner - 16 oz.

**Brand:** general motors
**Price:** € 99.42
**Availability:** ✅ In Stock

## Summary

> ⚡ Unlock your engine’s hidden power with GM’s ultimate cleaner!

## Quick Answers

- **What is this?** Genuine GM Fluid 88861803 Upper Engine and Fuel Injector Cleaner - 16 oz. by general motors
- **How much does it cost?** € 99.42 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/11905714-genuine-gm-fluid-88861803-upper-engine-and-fuel-injector-cleaner)

## Best For

- general motors enthusiasts

## Why This Product

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

## Key Features

- • **Trusted GM Quality:** OEM-grade product designed specifically for GM engines and beyond
- • **Eco-Conscious Formula:** Low VOC compliance means powerful cleaning with reduced environmental impact
- • **Instant Deposit Removal:** Experience immediate cleaning effects that restore engine efficiency
- • **Proven Performance Boost:** Real user results show up to 100% compression improvement on weak cylinders
- • **Powerful Multi-Action Cleaner:** Cleans fuel injectors, intake system, and piston tops for peak engine performance

## Overview

GM Genuine Fluid 88861803 is a 16 oz upper engine and fuel injector cleaner designed to remove stubborn deposits from fuel injectors, intake systems, and piston tops. Its low VOC formula ensures environmental compliance while delivering immediate cleaning results. Trusted by professionals and backed by real-world performance improvements, this OEM-grade cleaner revitalizes engine efficiency and power.

## Description

GM Upper Engine and Fuel Injector Cleaner is a low VOC compliant formulation that delivers immediate engine deposit cleaning. This product has multiple service applications including in-rail fuel injector cleaning, engine intake system deposit removal, and piston top soaking clean-up.

Review: Great Upper Engine and Fuel Injector Cleaner - This solution can be used as an induction or injector cleaner. Use with an injection cleaning apparatus for best results but, can be used without it. Thus, experience with injection cleaning systems would be recommended. Do not place the X66P directly in the fuel tank, for it may damage the fuel pump and other system components. (with the engine at operating temperature) When used with an injection cleaning apparatus(Depending on your equipment, calculate volume), Fill the injector cleaning tank with regular unleaded gasoline(90%) and the remaining 10% with AC Delco X66P. For induction cleaning, (caution)to prevent hydro-locking at such a low rpm, do not induce too much cleaner. Slowly induce the cleaner into the engine with rpm off of idle enough to prevent it from stalling (~2,000 rpm). Turn the engine off after inducing the cleaner and allow the cleaner to soak with the engine off for 30 mins to 1 hour. Restart and test drive.
Review: Unbelievable results! - I used the to engine cleaner recently on an old Saturn that burned some oil. They're notorious for sticking/clogged piston rings. This stuff used to be part of a GM procedure to reduce oil consumption on the early Northstar V8s, so I decided to give it a try. A baseline cold compression check was done with 2 cylinders at 150psi and 2 at 75psi. To start, all 4 spark plugs were pulled and a syringe was used to squirt 2oz into each cylinder. It was allowed to soak overnight. The next day each cylinder was drained with a tube and a vacuum pump to prevent hydro lock. The plugs were reinstalled and the engine started and revd up to knock things loose. It blew some white smoke and there was some carbon on the ground at the tailpipe. After that I took it for a ride and thought it felt a little peppier, but told myself it was just placebo effect. Later in the day I did a cold compression check (like the original test) and couldn't believe the gauge. Both of the weak cylinders had improved and there was 150psi across the board now. I tried this treatment for the sake of trying something new and the "there's nothing to lose" mindset and expected 10-20psi improvement, but doubling the compression on the weak cylinders is unbelievable.

## Features

- GM upper engine and fuel injector cleaner
- Delivers immediate engine deposit cleaning
- Product has multiple service applications
- Use for in-rail fuel injector cleaning, engine intake system deposit removal, and piston top soaking clean-up
- Low VOC compliant formulation

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00BK7LR36 |
| Best Sellers Rank | #4,911,082 in Automotive ( See Top 100 in Automotive ) #19,593 in Automotive Replacement Fuel Injectors |
| Brand | General Motors |
| Customer Reviews | 4.4 4.4 out of 5 stars (131) |
| Date First Available | February 20, 2013 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 15.2 ounces |
| Item model number | 88861803 |
| Manufacturer | GM |
| Manufacturer Part Number | 88861803 |
| Model | 88861803 |
| OEM Part Number | 88861803 |
| Product Dimensions | 7.7 x 4.2 x 1.9 inches |
| Voltage | 12 Volts |

## Images

![Genuine GM Fluid 88861803 Upper Engine and Fuel Injector Cleaner - 16 oz. - Image 1](https://m.media-amazon.com/images/I/61ep4U00ZGL.jpg)
![Genuine GM Fluid 88861803 Upper Engine and Fuel Injector Cleaner - 16 oz. - Image 2](https://m.media-amazon.com/images/I/81RA0o7ZbQL.jpg)

## Questions & Answers

**Q: Can this be put into an injector cleaning system pressure cylinder and engine runs directly off this chemical or does it have to be blended with gas?**
A: Mix 16oz bottle with 64oz (1/2 gal.) of diesel.  Run directly into fuel lines on top of engine.  Make sure to include the return line to your cylinder.  My 02 Duramax took over 1 1/2 hrs to burn thru mixture.  DO NOT put the cleaner in your fuel tank!!!  Works great!

**Q: Can you use this to put directly into the cylinder to free piston rings? If so, how should it be used? How much, how long, etc.**
A: Spray some WD- 40  into cylinder to free up piston.

**Q: Can I put this in the crankcase?**
A: this product is for cleaning fuel system not the oil system I would NOT put in crankcase

**Q: ?The product show is no longer avalible under this part number its now sold as 19355198 it has new packaging and pricing old stock is still ok**
A: Do not know about this. I do know the Genuine GM Fluid 88861803 superseded the 88861802, and I have not sought out any lately as I have two bottles of the 1803 left from several I bought.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Upper Engine and Fuel Injector Cleaner
*by J***E on December 14, 2015*

This solution can be used as an induction or injector cleaner. Use with an injection cleaning apparatus for best results but, can be used without it. Thus, experience with injection cleaning systems would be recommended. Do not place the X66P directly in the fuel tank, for it may damage the fuel pump and other system components. (with the engine at operating temperature) When used with an injection cleaning apparatus(Depending on your equipment, calculate volume), Fill the injector cleaning tank with regular unleaded gasoline(90%) and the remaining 10% with AC Delco X66P. For induction cleaning, (caution)to prevent hydro-locking at such a low rpm, do not induce too much cleaner. Slowly induce the cleaner into the engine with rpm off of idle enough to prevent it from stalling (~2,000 rpm). Turn the engine off after inducing the cleaner and allow the cleaner to soak with the engine off for 30 mins to 1 hour. Restart and test drive.

### ⭐⭐⭐⭐⭐ Unbelievable results!
*by B***R on April 1, 2017*

I used the to engine cleaner recently on an old Saturn that burned some oil. They're notorious for sticking/clogged piston rings. This stuff used to be part of a GM procedure to reduce oil consumption on the early Northstar V8s, so I decided to give it a try. A baseline cold compression check was done with 2 cylinders at 150psi and 2 at 75psi. To start, all 4 spark plugs were pulled and a syringe was used to squirt 2oz into each cylinder. It was allowed to soak overnight. The next day each cylinder was drained with a tube and a vacuum pump to prevent hydro lock. The plugs were reinstalled and the engine started and revd up to knock things loose. It blew some white smoke and there was some carbon on the ground at the tailpipe. After that I took it for a ride and thought it felt a little peppier, but told myself it was just placebo effect. Later in the day I did a cold compression check (like the original test) and couldn't believe the gauge. Both of the weak cylinders had improved and there was 150psi across the board now. I tried this treatment for the sake of trying something new and the "there's nothing to lose" mindset and expected 10-20psi improvement, but doubling the compression on the weak cylinders is unbelievable.

### ⭐⭐⭐⭐ go to u tube for insturctions
*by F***K on February 28, 2016*

you need to go to u tube for instructions on how to use this product their are no instructions on the bottle and you cant buy it over the counter in calif , I used it on a duramax diesel it seemed to work some but time will tell

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-01-28*