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Marvel Mystery Oil 50665 Ultimate Fuel and Motor Treatment, 12. Fluid Ounces

4.6 out of 5 stars 161 ratings

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  • 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
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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.


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4.6 out of 5 stars
4.6 out of 5
161 global ratings
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Top reviews from the United States

Reviewed in the United States on May 20, 2019
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5.0 out of 5 stars Works in newer diesel engines
By Jesse on May 20, 2019
Used this in my 2013 Jetta SportWagen TDI (one of the ones that sat in a Cali lot for almost 3 years!), was hesitant because of some reviews online saying it would increase the ppm of the diesel but it clearly says right on the bottle “Complies with the federal ultra-low sulfur content requirements for use in diesel motor vehicles and non-road engines.”

Will update my review if I notice anything changes.
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Reviewed in the United States on January 6, 2019
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Reviewed in the United States on July 10, 2018
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Reviewed in the United States on October 26, 2018
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Reviewed in the United States on May 29, 2018
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Reviewed in the United States on December 14, 2019
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Reviewed in the United States on June 9, 2020
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Reviewed in the United States on October 17, 2019
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