---
product_id: 41295362
title: "Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment, 12. Fluid Ounces"
brand: "marvel mystery oil"
price: "€ 70.72"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.gr/products/41295362-marvel-mystery-oil-50665-ultimate-fuel-and-motor-treatment-12
store_origin: GR
region: Greece
---

# 99% deposit removal fuel stabilization for easy starts rust & corrosion prevention Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment, 12. Fluid Ounces

**Brand:** marvel mystery oil
**Price:** € 70.72
**Availability:** ✅ In Stock

## Summary

> ⚡ Unlock your engine’s hidden potential with Marvel Mystery Oil!

## Quick Answers

- **What is this?** Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment, 12. Fluid Ounces by marvel mystery oil
- **How much does it cost?** € 70.72 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/41295362-marvel-mystery-oil-50665-ultimate-fuel-and-motor-treatment-12)

## Best For

- marvel mystery oil enthusiasts

## Why This Product

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

## Key Features

- • **Rust & Corrosion Shield:** Protects your engine from damaging ethanol-induced rust and corrosion.
- • **Universal Compatibility:** Works seamlessly with GDI, hybrids, synthetic oils, and ethanol blends.
- • **Long-Term Fuel Stability:** Advanced formula stabilizes fuel for months, ensuring smooth, easy startups every time.
- • **Power & Efficiency Booster:** Restores top-end lubrication to enhance power output and fuel economy.
- • **Engine Cleanser Extraordinaire:** Removes up to 99% more deposits than gasoline alone for peak performance.

## Overview

Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment is a cutting-edge additive designed for all engine types—including GDI and hybrids—that removes up to 99% more deposits than gasoline alone, prevents rust from ethanol fuels, and stabilizes fuel for months. It enhances lubrication, restores power, and improves fuel economy, making it a must-have for high-mileage vehicles and preventative maintenance.

## Description

Marvel Ultimate Fuel & Motor Treatment delivers superior cleaning, lubrication and stabilization inside your engine to enhance compression and power. Designed for today's most advanced systems including direct injection (GDI) and hybrids, Marvel Ultimate is also ideal for high mileage vehicles and for preventative maintenance. Marvel Ultimate should be added to fuel or used in the crankcase in oil; specially formulated even for use in synthetic oil and with most advanced fuels including Top Tier, ethanol blends, and biodiesels.

Review: KEEPS FUEL SYSTEM CLEAN - Marvel Mystery Fuel treatment is a good way to keep a vehicles fuel system clean. I highly recommend it for vehicles with GDI (gas direct injection) engines. When I first used it in my 2019 Hyundai Tucson, the engine idle seemed rough, but smoothed out after about 200 miles. A mechanic recommended to also fill up with ethanol free gasoline when I added the fuel treatment. Fuel economy dropped about two mpg also with the fuel treatment and ethanol free fuel. I was told that this was normal and was a result of everything being cleaned out of the fuel system. When I gassed after 350 miles, the engine ran much smoother and fuel economy increased substantially. The idle was very smooth as was performance. I now use it in my Ford Ranger as well with even better results.
Review: Marvelous for all vehicles - I got this to use in my Jeep Renegade and after using a couple bottles of it I could tell a difference in how the engine runs. So much quieter and runs a lot smoother. If I could find more to order I definitely would be using this in all of my vehicles. Just wish this was still being made.

## Features

- Use in all engines including GDI & Hybrids
- Marvel Ultimate Fuel & Motor Treatment removes up to 99% more deposits than gasoline alone
- Prevents rust and corrosion from Ethanol containing fuels
- Provides top end lubrication, essential for restoring power and fuel economy
- Advanced engine technology stabilizes fuel for months and helps promote easy start-ups

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B06XDPZ1F1 |
| Best Sellers Rank | #2,606,568 in Automotive ( See Top 100 in Automotive ) #4,454 in Motor Oils |
| Brand | Marvel Mystery Oil |
| Customer Reviews | 4.3 4.3 out of 5 stars (194) |
| Date First Available | March 1, 2017 |
| Global Trade Identification Number | 00077874506655 |
| Item Weight | 0.01 ounces |
| Item model number | 50665 |
| Manufacturer | Marvel Mystery Oil |
| Manufacturer Part Number | 50665 |
| Model | Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment, 12. Fluid Ounces |
| Product Dimensions | 3 x 3 x 9 inches |
| Size | Ultimate Fuel and Motor Treatment |
| UPC | 077874506655 |
| Vehicle Service Type | Various |

## Product Details

- **Brand:** Marvel Mystery Oil
- **Liquid Volume:** 12 Fluid Ounces
- **Package Information:** Bottle
- **UPC:** 077874506655
- **Vehicle Service Type:** Various

## Images

![Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment, 12. Fluid Ounces - Image 1](https://m.media-amazon.com/images/I/818CboGTtUL.jpg)
![Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment, 12. Fluid Ounces - Image 2](https://m.media-amazon.com/images/I/819Oik2EPnL.jpg)
![Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment, 12. Fluid Ounces - Image 3](https://m.media-amazon.com/images/I/81Z62xPXd8L.jpg)
![Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment, 12. Fluid Ounces - Image 4](https://m.media-amazon.com/images/I/81i6ebjpKzL.jpg)
![Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment, 12. Fluid Ounces - Image 5](https://m.media-amazon.com/images/I/81m4T2cVt3L.jpg)

## Questions & Answers

**Q: Can it harm the Catalytic converter  or  Oxy sensors?**
A: No not at all

**Q: How often can i use this marvel mystery motor & fuel treatment ?**
A: I add at every oil change to gas. I also add standard marvel mystery oil, 1 pint, to crank case 500 miles prior to oil change.

**Q: Does this have polyetheramine (PEA)?**
A: None I read or saw in past. Don't have a bottle here as I looked.

**Q: Which one of the MMO's will help a whining in tank fuel pump?**
A: Either might help. But that whinnying means fuel pump is about to go.

## Customer Reviews

### ⭐⭐⭐⭐⭐ KEEPS FUEL SYSTEM CLEAN
*by F***Y on April 9, 2023*

Marvel Mystery Fuel treatment is a good way to keep a vehicles fuel system clean. I highly recommend it for vehicles with GDI (gas direct injection) engines. When I first used it in my 2019 Hyundai Tucson, the engine idle seemed rough, but smoothed out after about 200 miles. A mechanic recommended to also fill up with ethanol free gasoline when I added the fuel treatment. Fuel economy dropped about two mpg also with the fuel treatment and ethanol free fuel. I was told that this was normal and was a result of everything being cleaned out of the fuel system. When I gassed after 350 miles, the engine ran much smoother and fuel economy increased substantially. The idle was very smooth as was performance. I now use it in my Ford Ranger as well with even better results.

### ⭐⭐⭐⭐⭐ Marvelous for all vehicles
*by A***Y on March 13, 2024*

I got this to use in my Jeep Renegade and after using a couple bottles of it I could tell a difference in how the engine runs. So much quieter and runs a lot smoother. If I could find more to order I definitely would be using this in all of my vehicles. Just wish this was still being made.

### ⭐⭐⭐⭐ As advertised. Smells potent like it'll do some cleaning
*by A***N on December 15, 2019*

Not sure if it helped with anything but I'm assuming so. It had a nice potency to it that I would safely say did some cleaning. My car is 23 years old so I wasn't expecting a dramatic difference.

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---

*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-03-14*