Stanadyne Diesel Lubricity Formula Concentrate 64 oz — Restores Injectors & Protects High-Pressure Pumps

Stanadyne 38561 Diesel Lubricity Formula is a concentrated diesel fuel additive designed to restore and boost lubricity, protect fuel injectors and pumps, and improve water separation in diesel systems.

Keeping modern diesel engines running smoothly requires fuel with adequate lubrication. Stanadyne's Lubricity Formula delivers an OEM-approved concentrate that supplies significantly more lubricating content than standard additives, helps reduce wear in injection components, and aids filter/separator performance by encouraging water demulsification. This 64 oz bottle provides a practical supply for fleet service, heavy equipment, or extended personal use.

How does this formula protect fuel system components?

The Stanadyne lubricity concentrate forms a microscopic protective layer on metal surfaces within the fuel system, reducing metal-to-metal contact and friction under high-pressure conditions. Applied regularly at recommended dosages, it lowers the rate of surface wear on high-pressure pumps and injectors without altering fuel combustion characteristics.

• Provides five times more lubricating content than other Stanadyne additives
• Forms a protective boundary film on moving parts
• Reduces wear on high-pressure pumps and injector tips
• Compatible with diesel fuels and common additive packages

How much fuel does a 64 oz bottle treat and what is the dosing?

Stanadyne's dosing is simple: an 8 oz one-shot treats about 15 gallons of diesel. A 64 oz container contains eight 8 oz doses, so it treats roughly 120 gallons in total when used at the one-shot rate. Because Stanadyne products are blendable, you can adjust dosage for heavier-duty conditions without harming the fuel system.

• 8 oz treats ~15 gallons; 64 oz treats ~120 gallons total
• One-shot dosing for routine maintenance; higher dosing possible for severe wear
• Safe to blend with other Stanadyne diesel additives
• Double-dosing is not damaging, though benefits are not necessarily doubled

Will this additive affect fuel filters or water separation?

The formula is designed to demulsify water, encouraging separation so water can be removed by standard filter/separator systems. That helps keep filters functioning efficiently and reduces the chance of water-related injector or pump problems. It’s formulated to improve separator performance without compromising filter life when used as directed.

• Promotes water demulsification for better separator efficiency
• Helps maintain filter performance by reducing water carryover
• Compatible with diesel filter/separator systems when dosed properly
• Supports cleaner fuel delivery to injectors and pumps

Is the Stanadyne Lubricity Formula compatible with my engine and fuels?

This product is OEM-approved and formulated for broad compatibility with modern diesel engines and current diesel fuel specifications. It can be used alongside other Stanadyne additives and in diesel blends commonly used in on-highway and off-highway equipment. Always follow engine manufacturer recommendations for additives when available.

• Approved by Original Equipment Manufacturers (OEMs)
• Works with standard diesel fuels and most additive packages
• Safe for use in high-pressure common-rail and older mechanical systems
• Check engine maker guidance for any specialized fuel requirements

Who is this for: Stanadyne 38561 Diesel Lubricity Formula 64 oz is suited to fleet managers, diesel technicians, owners of heavy equipment, and owners of personal diesel vehicles who need a concentrated, OEM-approved lubricity boost. It’s ideal for applications where wear is a concern, for seasonal maintenance, or when fuel sources may lack sufficient natural lubricity. The 64 oz size balances economy and convenience for regular maintenance cycles or for servicing multiple vehicles.