Mishimoto MMTS-LEX-06 Racing Thermostat 68 DegC for 06-15 Lexus IS250/IS350/GS350

Vehicle Fitment

• 2006-2015 Lexus IS250 / IS250 C (2.5L V6)
• 2006-2015 Lexus IS350 / IS350 C (3.5L V6)
• 2006-2006 Lexus GS300 (3.0L V6)
• 2007-2015 Lexus GS350 / GS350 F Sport (3.5L V6)
• 2007-2018 Lexus GS450h / GS450h F Sport (3.5L V6 Hybrid)

Fitment Notes

• Direct fit -- includes OEM-quality thermostat housing
• Opens at 68°C (154.4°F) vs. stock 82°C (179.6°F)
• 25.2°F (14°C) earlier opening than OEM
• Verify full fitment list for your specific model/year

Features

• Mishimoto racing thermostat with housing
• 68°C (154.4°F) lower opening temperature
• Allows coolant to reach radiator sooner for faster heat shedding
• Ideal for track, spirited driving, and modified engines
• OEM-quality housing for factory-precise fitment
• Mishimoto Lifetime Warranty

Specifications

• Type: Racing Thermostat with Housing
• Opening Temperature: 68°C (154.4°F)
• Stock Opening Temperature: 82°C (179.6°F)
• Temperature Reduction: 14°C (25.2°F) Earlier
• Housing: OEM-Quality, Included
• Warranty: Mishimoto Lifetime

Included Components

• 1x Mishimoto racing thermostat (68°C)
• 1x OEM-quality thermostat housing

Product Description

The Mishimoto MMTS-LEX-06 is a racing thermostat with OEM-quality housing for the 2006-2015 Lexus IS250, IS350, GS300, GS350, and 2007-2018 GS450h. This thermostat opens at 68°C (154.4°F), which is 14°C (25.2°F) earlier than the stock 82°C thermostat, allowing coolant to reach the radiator sooner and begin shedding heat faster. The lower operating temperature helps the cooling system work at peak efficiency, which is critical during spirited driving, track sessions, and on modified or turbocharged engines that generate additional heat.

The included OEM-quality thermostat housing ensures a direct, factory-precise fit with no modifications required. For maximum cooling performance, Mishimoto recommends pairing this thermostat with a Mishimoto performance aluminum radiator. Established in 2005, Mishimoto is the world leader in performance cooling products for sport compact, modern muscle, European performance, and classic vehicles. Backed by the Mishimoto Lifetime Warranty.