Additional Details:

• Temperature Rating: 160°F
• Fits: 1998 & newer GM V-6 & V-8 engines with closed cooling

Use With:

• 18-3568: Thermostat Kit
• 18-3667: Thermostat Kit

Interchanges/Replaces

GLM

• 13040

Mallory

• 9-43001
• 9-43016

Mercruiser Stern Drive

• 991551
• 99155A1
• 99155T2

Key Features:

• 160°

Additional Details:

• Fits: GM V-6 & V-8 engines with closed cooling (1998 & newer)

Interchanges/Replaces

Mercruiser Stern Drive

• 99155T1

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-3555	GLM 13040 Mallory 9-43001 9-43016 Mercruiser Stern Drive 991551 99155A1 99155T2	1	Thermostat		N/A
18-1508	GLM 85860 Mercruiser Stern Drive 25-807134 25-8071341	1	Thermostat Seal		N/A