My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

Quicksilver 991551 160°F Marine Thermostat for MerCruiser V6 & V8 Closed Cooling

Manufacturer

Picture for manufacturer Quicksilver

Part Number

99155 1
11 reviews
Sale Price

$30.87

In Stock (6)

delivery box

Usually delivered within 2 days

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Quicksilver 991551 is an OEM-grade replacement thermostat rated at 160°F, engineered specifically for 1998 and newer MerCruiser marinized V-6 and V-8 engines built by General Motors equipped with closed cooling systems. Produced by Mercury Marine to stringent original equipment manufacturer specifications, this thermostat ensures proper engine temperature regulation to protect performance and longevity.

Key Features:

  • 160°F thermostat — correct operating temperature for compatible closed-cooling GM V-6 and V-8 MerCruiser applications
  • OEM specifications — manufactured to Mercury Marine's original equipment standards for a precise, reliable fit
  • Easy installation — replaceable with common hand tools; consult your owner's manual for proper removal and installation procedures
  • Cross-reference part numbers: 99155T1, 99155T 1, Mallory Marine 9-43016

About Quicksilver: Quicksilver is part of the Mercury Marine family of companies and has been the trusted supplier of Mercury Marine OEM replacement engine parts, oils, and accessories for over 65 years. Every Quicksilver part is designed, tested, and validated to meet the demands of the marine environment — delivering performance, protection, and peace of mind.

*****

Very user friendly website.

Good prices compared to other websites. Good customer reviews. Pretty fast shipping. I would recommend this site.

good so far, just ordered a part not available anywhere but autoplicity

5 minute ordering process, faster than going to the auto parts house. Everything went as Autoplicity indicated. I ordered on Saturday, order was processed on Monday, item was shipped on Wednesday(tracking info for UPS was emailed on Wednesday), item was r

Autoplicity had the best price on an ARB locker. They shipped it quickly but was not able to give me the tracking number until after I had already received it.

yes happy after a good customer serice helped with a price adjustment to my order. they did have good prices on most things, but it took some work to find the lowest price, so you do need to be a smart shopper.

Great price,fast shipping, will buy from again. Thanks

very fast

Awesome place to get parts from. Went looking all over the city of houston to find a certain light everyone was sold out tried online two "Huge chain name" places were also sold out. Stumbled on Autoplicity and they had just what I needed!

Thanks

Share icon
Return Policy
Returns are easy at Autoplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy