Primrose 403 Protect-O-Lube Plus


  • Performance Characteristics:
  • Improve Combustion & Fuel Economy
  • Reduces Fuel Waste and Emissions
  • Increases RPMs
  • Reduces Frictional Drag
  • Eliminates Piston Ring Sticking & Scoring
  • Eliminates Sticking Valves
  • Cleans & Lubricates Fuel Injectors & Carburetors
  • Eliminates Carbon, Varnish & Sludge
  • Neutralizes All Harmful Engine Acids

*To order (in full case-quantities only), please call 1-800-341-6516 or email

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SKU: PRIMROSE:P040332Z Categories: ,

Protect-O-Lube Plus is recommended for use in concentrations of 1% by volume in diesel*, gasoline of all grades including gasohol and kerosene fuels, to neutralize the corrosive effects of engine acids created during combustion from sulfur contained in the fuel. It also absorbs moisture, prevents icing, removes carbon, gum, sludge and varnish deposits, improves combustion, cleans injectors and carburetors, lubricates top rings, frees sluggish valves and improves ring flexing.

Protect-O-Lube Plus is a superior flushing agent for use in crankcases, compressors, hydraulic and turbine/circulating systems and automatic transmissions.

Protect-O-Lube Plus can also be used to free frozen bolts and nuts, or applied as a superior rust preventative on boats, ships, off-road machinery, farm implements, fertilizer storage and application equipment and many other similar uses. Protect-O-Lube Plus is an extraordinary firearm lubricant, ideal for all styles and mechanisms.

*This diesel fuel additive does not comply with federal ultra-low sulfur content requirements for use in model 2007 and newer diesel motor vehicles or model year 2011 and newer diesel non-road equipment engines.

Technical Data

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Toll free: 1.800.341.6516

Lubrication Specialties, LLC. (LSI) creates problem-specific solutions by providing additives, lubricants and oil to end-users of diesel and gas engines.  Often heard as a promotional tagline, “Powered By Science” is a solution-focused process that drives product development.  The LSI Laboratory (LSI Labs) is the on-site research, development and discovery arm of LSI responsible for tackling difficult to solve problems and uncovering effective solutions.


LSI strives to continue to develop products that will specifically and globally reduce consumers carbon footprint and personal impact on the environment.


To solve real world “industry specific” problems that no one else can by quickly providing high quality solutions to all consumers. To create an unparalleled team with our employees, customers, and partners.


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