Febi 10263 Engine Coolant Thermostat

Engine Cooling Control for BMW and Mercedes-Benz

The Febi 10263 engine coolant thermostat regulates coolant flow to help the engine reach and maintain the correct operating temperature. With an 80-degree start-to-open temperature, it supports stable warm-up and consistent cooling performance in a wide range of BMW and Mercedes-Benz applications.

Compatible With BMW 323i, 323is, 328i, 328is, 528i, Z3, 318is, 318ti, 320i, 325i, 325is, 525i, and 525iT, as well as Mercedes-Benz S420, S500, SL500, E420, E500, 400E, 400SE, 400SEL, 500E, 500SEC, 500SEL, 500SL, 420SEL, 560SEC, 560SEL, and 560SL applications listed below.

• Engine coolant thermostat with 80-degree start-to-open temperature
• Includes o-ring where noted in fitment data
• Febi part number 10263 for direct catalog matching
• Cross-reference: Mercedes-Benz 116 200 03 15
• Fits multiple BMW E36, E39, and Z3 applications plus select Mercedes-Benz V8 models

Fitment Details

• Fits 1998-1999 BMW 323i, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1998-1999 BMW 323is, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1996-1999 BMW 328i, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1996-1999 BMW 328is, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1998 Mercedes-Benz S420, N/A; additional information: with o-ring; opening temperature: 80; to engine no.: 026750
• Fits 1996-1999 Mercedes-Benz S500, N/A; additional information: with o-ring; opening temperature: 80; to engine no.: 056885
• Fits 1998 BMW 528i, N/A; additional information: with o-ring; opening temperature: 80; to construction year: 09/1998
• Fits 1998 BMW Z3, N/A; additional information: with o-ring; opening temperature: 80; to construction year: 09/1998
• Fits 1997 BMW 528i, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1997 BMW Z3, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1996 Mercedes-Benz SL500, N/A; weight (lbm / kg) / 0.31; febi
• Fits 1992-1995 BMW 318is, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1995 BMW 318ti, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1992-1995 BMW 320i, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1992-1995 BMW 325i, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1992-1995 BMW 325is, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1991-1995 BMW 525i, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1994-1995 Mercedes-Benz E420, N/A; additional information: with o-ring; opening temperature: 80; to engine no.: 020770
• Fits 1994-1995 Mercedes-Benz S420, N/A; weight (lbm / kg) / 0.31; febi
• Fits 1994-1995 Mercedes-Benz S500, N/A; weight (lbm / kg) / 0.31; febi
• Fits 1994-1995 Mercedes-Benz SL500, N/A; additional information: with o-ring; opening temperature: 80; to engine no.: 013777
• Fits 1994 Mercedes-Benz E500, N/A; additional information: with o-ring; opening temperature: 80; to engine no.: 010204
• Fits 1993 BMW 525iT, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1992-1993 Mercedes-Benz 400E, N/A; weight (lbm / kg) / 0.31; febi
• Fits 1993 Mercedes-Benz 400SEL, N/A; weight (lbm / kg) / 0.31; febi
• Fits 1992-1993 Mercedes-Benz 500E, N/A; weight (lbm / kg) / 0.31; febi
• Fits 1993 Mercedes-Benz 500SEC, N/A; additional information: with o-ring; opening temperature: 80; to engine no.: 056885
• Fits 1992-1993 Mercedes-Benz 500SEL, N/A; weight (lbm / kg) / 0.31; febi
• Fits 1990-1993 Mercedes-Benz 500SL, N/A; weight (lbm / kg) / 0.31; febi
• Fits 1992 Mercedes-Benz 400SE, N/A; weight (lbm / kg) / 0.31; febi
• Fits 1986-1991 Mercedes-Benz 420SEL, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1990-1991 Mercedes-Benz 560SEC, N/A; weight (lbm / kg) / 0.31; febi
• Fits 1986-1991 Mercedes-Benz 560SEL, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1986-1989 Mercedes-Benz 560SEC, N/A; additional information: includes o-ring; opening temperature at 80 degrees
• Fits 1986-1989 Mercedes-Benz 560SL, N/A; weight (lbm / kg) / 0.31; febi
• Fits 1985 Mercedes-Benz 500SEC, N/A; additional information: includes o-ring; opening temperature at 80 degrees

Common Cooling Issues It Can Address

• Engine running too cool or taking too long to warm up
• Temperature fluctuation during normal driving
• Delayed coolant circulation control after cold start
• Thermostat replacement during cooling system service
• Leak repair at the thermostat sealing surface when the o-ring is serviced

Installation Notes and Tips

Verify the engine number and construction date notes before ordering, especially on Mercedes-Benz applications with engine-number cutoffs. Clean the thermostat housing sealing surface thoroughly and confirm the correct orientation during installation. Replace the thermostat only with the correct 80-degree specification for the listed BMW and Mercedes-Benz applications, and inspect the cooling system for contamination or worn hoses before reassembly.

Quality Assurance

Febi is an established aftermarket brand with OE-style replacement coverage for European vehicles. Part number 10263 is cataloged for the listed BMW and Mercedes-Benz fitments and cross-references Mercedes-Benz 116 200 03 15 for the same application.