# MotoRad ST20 Engine Coolant Safety Lever Radiator Cap for 1990-2014 BMW 3-Series ### Specifications Cap Depth: 1.48 in Coolant Recovery System: Open & Closed System Lever Type: Safety Lever Material: Stainless Steel, Plastic, Rubber Pressure Rating: 20 psi Quick Pressure Release: Yes SAE Pressure Range: 18-22 psi Width: 2.25 in ### Features - Offer precise pressure control - Ensure the proper fit - Feature safety lever - Easy installation ### Product Details Engine Coolant Safety Lever Radiator Cap (ST20) by MotoRad®. Pressure: 20 psi. MotoRad radiator caps are designed and manufactured to offer precise control for the automotive cooling system. MotoRad safety lever radiator caps utilize a lever that locks the cap to the filler neck requiring the lever be lifted before removal. When the lever is lifted, the valve pressurizing in the cooling system is opened and pressure is vented through the overflow tube making it safe to remove the radiator cap. MotoRad radiator pressure caps are designed and manufactured to offer precise pressure control for the automotive cooling system. Most standard radiator caps are also offered in a version with a safety lever feature. MotoRad’s radiator caps are manufactured to meet all OEM requirements and each part is factory tested prior to shipping to customers. A slowly failing, worn out or faulty radiator cap can result in overheating, loss of coolant or even major engine damage. One function of the radiator cap is to keep pressure on the cooling system. If the pressure on the system drops because of a failing radiator cap, the boiling point of the coolant also drops. If the boiling point drops enough, it can cause the engine to overheat. If you replace a thermostat and the radiator cap is more than three years old, chances are is not holding to the same pressure as a new cap. Explain to your customer that by replacing the thermostat and the radiator cap, their vehicle should run within the specified operating temperature and the coolant system will be properly pressurized. The radiator pressure cap is a very important component of the system. The cap monitors the pressure of the system and adjusts to maintain the desired pressure (normally in the 15 psi range). If an improper cap or a defective cap is used, the correct system pressure will not be maintained. If the system pressure is too low the coolant will be allowed to boil at unacceptable temperatures. If the system pressure is too high, damage to the system can occur, potentially causing loss of coolant and an engine overheating condition. Brand: MotoRad Part Number: ST20 UPC: 055644910222 OE Numbers: 19137333 ### Vehicle Fitment Table Year Make Model Position Fitment Precision Note 1990 BMW 3-Series 1991 BMW 3-Series 2007 Chrysler Aspen 2008 Chrysler Aspen 2009 Chrysler Aspen 2001 Dodge Dakota 2002 Dodge Dakota 2003 Dodge Dakota 2004 Dodge Dakota 2005 Dodge Dakota 2006 Dodge Dakota 2007 Dodge Dakota 2001 Dodge Durango 2002 Dodge Durango 2003 Dodge Durango 2004 Dodge Durango 2005 Dodge Durango 2006 Dodge Durango 2007 Dodge Durango 2008 Dodge Durango 2003 Dodge Sprinter 2004 Dodge Sprinter 2005 Dodge Sprinter 2006 Dodge Sprinter 2008 Dodge Viper 2002 Freightliner Sprinter 2003 Freightliner Sprinter 2004 Freightliner Sprinter 2005 Freightliner Sprinter 2006 Freightliner Sprinter 1990 Mercedes C Class 1991 Mercedes C Class 1992 Mercedes C Class 1993 Mercedes C Class 1994 Mercedes C Class 1995 Mercedes C Class 1996 Mercedes C Class 1997 Mercedes C Class 1998 Mercedes C Class 1999 Mercedes C Class 2000 Mercedes C Class 2014 Mercedes CL Class 1990 Mercedes E Class 1991 Mercedes E Class 1992 Mercedes E Class 1993 Mercedes E Class 1994 Mercedes E Class 1995 Mercedes E Class 1990 Mercedes S Class 1991 Mercedes S Class 1992 Mercedes S Class 1993 Mercedes S Class 1994 Mercedes S Class 1995 Mercedes S Class 1996 Mercedes S Class 1997 Mercedes S Class 1998 Mercedes S Class 1999 Mercedes S Class 1990 Mercedes SL Class 1991 Mercedes SL Class 1992 Mercedes SL Class 1993 Mercedes SL Class 1994 Mercedes SL Class 1995 Mercedes SL Class 1996 Mercedes SL Class 1997 Mercedes SL Class 1998 Mercedes SLK Class 1999 Mercedes SLK Class 2000 Mercedes SLK Class 2001 Mercedes SLK Class 2002 Mercedes SLK Class 2003 Mercedes SLK Class 2004 Mercedes SLK Class ### FAQ **Will this fit my vehicle?** Please verify your year, make, model, position, and any fitment notes using the Vehicle Fitment Table above before purchase. **What part number is this?** The listed part number is ST20. **Is this product designed for direct replacement?** Yes. This product is intended to match the compatible vehicle applications listed in the fitment table. **Should I confirm fitment before ordering?** Yes. Always compare your original part, position, and vehicle details with the fitment table before ordering. ### Common Searches - Engine Coolant Safety Lever Radiator Cap for BMW 3-Series - ST20 fitment - MotoRad Engine Coolant Safety Lever Radiator Cap - 1990 BMW 3-Series Engine Coolant Safety Lever Radiator Cap ## Details - **Price:** 10.61 CAD - **Vendor:** MotoRad - **Type:** Engine Coolant Safety Lever Radiator Cap - **Tags:** 1990-1991 BMW 3-Series, 1990-1995 Mercedes E Class, 1990-1997 Mercedes SL Class, 1990-1999 Mercedes S Class, 1990-2000 Mercedes C Class, 1998-2004 Mercedes SLK Class, 2001-2007 Dodge Dakota, 2001-2008 Dodge Durango, 2002-2006 Freightliner Sprinter, 2003-2006 Dodge Sprinter, 2007-2009 Chrysler Aspen, 2008 Dodge Viper, 2014 Mercedes CL Class, Automotive, Engine Coolant Safety Lever Radiator Cap, MotoRad, ST20 ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 10.61 CAD | In stock | ## Images - MotoRad ST20 Engine Coolant Safety Lever Radiator Cap for 1990-2014 BMW 3-Series --- > Source: [Standard Auto Part](https://www.standardautopart.com/products/motorad-st20-engine-coolant-safety-lever-radiator-cap) > Updated: 2026-08-17