Welcome to DEF Warehouse - DEF Fluid & Automotive Supply Delivery – Islip, NY

DEF Warehouse proudly delivers Diesel Exhaust Fluid (DEF), engine oils, lubricants, antifreeze, washer fluid, and shop supplies to businesses, fleets, and municipalities across Islip, NY. Whether you’re based in Bay Shore, Brentwood, Central Islip, or Ronkonkoma, we’re your trusted source for bulk fluids and automotive maintenance supplies in Suffolk County.

We specialize in fast, reliable delivery to keep your operation running smoothly—with competitive prices and unmatched service.

We supply top-quality, API-certified DEF fluid to diesel fleets across Islip. Whether you’re operating sanitation trucks, transit buses, or delivery vans, our DEF meets ISO 22241 standards and is available in:

    •    Bulk DEF tank fills

    •    330-gallon totes

    •    55-gallon drums

    •    2.5-gallon jugs (by the case)

Our service area covers all of Islip Township, including Bay Shore, East Islip, West Islip, Brentwood, Islip Terrace, and Sayville. Whether you’re located near the Southern State Parkway or Sunrise Highway, we deliver straight to your door.

From highway trucks to heavy equipment and commercial vans, DEF Warehouse provides the motor oils and lubricants you need to stay compliant and protected:

    •    Heavy-duty diesel engine oils (15W-40 CK-4, 10W-30 FA-4)

    •    Passenger car motor oils (5W-30, 0W-20 SP/GF-6)

    •    Hydraulic oils, transmission fluids, gear oils

    •    Chassis grease & multi-purpose greases

Whether you’re in Ronkonkoma, Bohemia, or Holbrook, our local delivery ensures you have the fluids you need—on time, every time.

We deliver reliable seasonal fluids for maintenance shops and DPWs across Islip:

    •    Extended-life antifreeze (fleet strength or 50/50)

    •    Heavy-duty coolants for trucks and equipment

    •    All-season windshield washer fluid

    •    Winter washer fluid (rated to -20°F)

Whether you’re in Oakdale or Great River, our warehouse keeps you prepared for Long Island’s extreme weather.

Keep your garage or fleet facility fully stocked with essential shop supplies from DEF Warehouse:

    •    Spill kits, absorbent pads & floor dry

    •    Gloves, rags, degreasers & brake cleaner

    •    Funnels, pumps, oil containers & more

    •    PPE and worksite safety items

We support both small shops and large operations in Central Islip, East Islip, Bohemia, and Bayport.

Our Suffolk County delivery service covers every neighborhood in the Town of Islip, including:

    •    Bay Shore

    •    Brentwood

    •    Central Islip

    •    Islip Terrace

    •    East Islip

    •    West Islip

    •    Sayville

    •    Bohemia

    •    Ronkonkoma

    •    Oakdale

    •    Great River

    •    Bayport

    •    Holbrook

    •    Hauppauge

    •    Brightwaters

We also serve nearby towns like Smithtown, Patchogue, and Brookhaven.

Our clients in Islip include:

    •    Trucking and transportation companies

    •    School bus depots and DPWs

    •    Auto repair and body shops

    •    Construction and landscaping businesses

    •    Sanitation and waste management operations

Whether you manage 5 vehicles or 500, DEF Warehouse is the fluid and supply partner you can count on.

•    Local, fast delivery to all parts of Islip

    •    Competitive pricing and volume discounts

    •    Full range of DEF, oils, fluids, and shop products

    •    Responsive customer service

    •    Tailored solutions for your fleet or facility

Our team understands the demands of operating in Suffolk County—and we deliver exactly what you need, when you need it.

Get in touch with DEF Warehouse to schedule a delivery or request a quote for DEF, oils, antifreeze, or shop supplies.

    •    Phone: 855-228-9333

    •    Email: sales@defwarehouse.com

    •    Website: www.defwarehouse.com

We make it easy to stay stocked. Serving all of Islip and beyond—your trusted Long Island DEF and lubricant partner.