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30% Off Online Orders of Select Hard Parts. Enter Promo Code MMJ30 in Cart.

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Receive Up To 30% Off Your Online Purchase Of Select Parts And Accessories
Use promotional code MMJ30 at checkout to receive 30% off the following categories: Select Brake Parts, Select Hi-Performance and Truck Accessories, Batteries, Paint, Splash Guards, Select Ventvisors & Bug Shields, Springs & Spacers, Water Pumps, Belts, A/C Parts, Starters, Alternators, Fuel Pumps, Radiators, Radiator Fans, Thermostats, Caps & Clamps, Clutches, Spark Plugs, Plug Wires, CV Axles, Battery Chargers & Booster Cables, OE Locks, Rack & Pinons, Window Motors, RainX Wipers, Appearance Chemicals, Floor Mats, Lift Equipment, Hand Tools, Travel Accessories, Car Covers, Seat Covers, Wheel Covers, Body Repair, Collectibles and Apparel.

Use promotional code MMJ20 at checkout to receive 20% off the following categories: Ignition, Shocks & Struts, Chassis, Jumpstarts, Air Filters, Oil Filters, Bearings & Seals, Engine Parts, Wash Accessories, Outdoor Lifestyle, Towing, Mini Air Compressors, Tire Repair Accessories, Mufflers, Grease/Oil, Additive Chemicals, P/S Pumps, Cooling Product, Timing Belts, Specialty Tools, Radiator Hose, Motor Mounts, Mirrors, Lug Nuts, Sealants/Adhesives, Fuel Filters, P/S Hoses, Gas Cans, Oil Change Accessories, Help, Wiper Motors, Loaner Tools, Air Compressors, Horns, Books, Distributors, Sun Control and Exhaust Adapters.

Use promotional code MMJ15 at checkout to receive 15% off the following categories: Test Equipment, Power Tools, Emergency Supplies, Electronics and Stereo & Accessories (MAP pricing Exclusions).

Offers not valid in combination with any other discounts, promotions or items already on sale. Not valid on gift cards, special orders, installed merchandise, commercial or fleet purchases. Those products that are included in these offers will be displayed in product search results and product detail pages. Excludes the following brands: WeatherTech, Champion, Powerstop, Razor, Traxxas, Superchips, Hypertech, Edge, Bully Dog, Diablo, Edelbrock, Holley, NOS, Proform, Specialty Auto, Autometer, Accel, K&N, Kenwood, Pioneer, Sony, Thule, Thule Karrite, JVC, Flowmaster, Hurst, B&M, MSD, Moog, Wagner, Philips and BBK Performance. Valid online until 11:59 PM EST on 11/22/17.

Receive 10% Off Wagner branded brake parts with your online purchase. Use promotional code: WAGNER10.

Receive 20% Off Select Champion branded products with your online purchase. Use promotional code: CHAMP20.

Receive 10% Off Select FelPro branded products with your online purchase. Use promotional code: FELPRO10.

Free Shipping on Orders Over $50 or in-store pickup


The TRANSMISSION is one of a vehicle's most vital components. With almost 1,000 FINELY ENGINEERED, PRECISION PARTS, it is one of the most complex and expensive units to repair or replace. Using the right oil and changing it at the right time is the key to preventing transmission problems before they occur.

Service your transmission as recommended to improve shifting performance, help improve fuel economy, prevent leaks and extend transmission life. Castrol’s® Transmax® ATF fluids are OEM approved and specially formulated to protect vital transmission components.

Castrol® Transmax® with Smooth Drive Technology™ automatically adjusts its friction level in response to changing pressures on critical transmission parts – delivering enhanced protection and a smoother drive for longer, eliminating noise and shudder and keeping things running like clockwork.

Castrol® Transmax® Full
Synthetic Multi-vehicle with
Smooth Drive Technology™
First product licenced for both GM DEXRON®-VI and Ford MERCON® LV and exceeds JASO 1A requirements.

Castrol® Transmax®
DEXRON®-VI with Smooth
Drive Technology™
Certified for use in all General Motors vehicles.

Castrol® Transmax®
Smooth Drive Technology™
Certified for use in Ford vehicles that require Mercon® or Mercon® V.

Castrol® Transmax® ATF+4®
Full synthetic formula exceeds ATF+3® requirements. For use in Chrysler vehicles.

Castrol® Transmax®
For use in older Ford and General Motors vehicles.

Castrol® Transmax® Import
For use in Honda, Toyota, Nissan and other imported vehicles.

Castrol® Transmax® Type F
For use in older Ford vehicles that require Type F ATF. Formulated to control transmission wear.