Welcome 

Your ISX - X15 Oil Thermostat Replacement System; Home of the Hack Nation O.T.R. Oil thermostat replacement. Is your trucks oil running 240+ degrees, making you feel uncomfortable?
We've got the solution for you! Our 100% Lazer welded and coated O.T.R. Built right here in the USA!! With our Oil Thermostat Replacement System not only do you get cooler oil,  
it also helps keep your coolant at a normal level so the fan isn't cycling constantly, 
your oil viscosity stays at a higher rate for a longer period of time. 
Our Patent Pending products are built to beat the heat!

Grizzly Specialized Inc  is dedicated to providing exceptional cooler oil solutions for semi truck drivers. 
Our mission is to promote the benefits of oil cooling and ensure that all truck drivers experience improved engine performance and longevity. With our innovative products, 
we strive to contribute to a smoother and more efficient driving experience while extending the lifetime of your semi trucks. Find out more about our journey and commitment to excellence.

"Grizzly Specialized Cooler Solutions For Your Truck – Drive with Confidence! Built right here in the U.S.A. Owner operators design for the owner operator.