ValvTect Octane Performance Improver
ValvTect Valvtect
  • ValvTect Octane Performance Improver

ValvTect Octane Performance Improver

ValvTect Octane Performance Improver (OPI) is a patented combustion modifier, detergent/dispersant technology that is specially formulated for heavy-duty, high performance marine engines.
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$22.94 / ea
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Tech Spec Product Info User Generated Content


  • Improve octane performance up to 5 numbers.
  • Improve engine power.
  • Improve fuel economy.
  • Reduce operating costs.
  • Provide more complete combustion.
  • Provide quicker and smoother acceleration.
  • Improve piston cleanliness.
  • Reduce valve seat wear.
  • Prevent exhaust valve sticking.
  • Prevent loss of compression.


ValvTect's OPI technology allows marine engines to operate at peak power and performance by improving the engine octane performance, and preventing premature engine wear. A premium detergent cleans up & keeps clean the entire fuel system including combustion chambers, intake valves, port fuel injectors, and carburetors to keep engines running in "like new" condition.

BRAND: ValvTect
Fuel: Gasoline
Type: Fuel Additives
4 1


by PowerReviews
ValvTect Octane Performance Improver

(based on 1 review)

Ratings Distribution

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  • 1 Stars



Reviewed by 1 customer

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(0 of 1 customers found this review helpful)


Helped my engine run better

By Butchgoesdutch

from Benton Harbor, MI

About Me Competitive

Verified Reviewer


  • Easy to Use


  • None

Best Uses

  • Engine
  • Fuel system

Comments about ValvTect Octane Performance Improver:

This ValveTect product made a difference with my engine. I was having issues with hesitation, rough running and some misfiring. Suspecting the fuel- I made only one change- add this product to the tank. Within a couple of days the engine was smooth with none of the previous issues. I'm sold.

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