Does everyone stay with the factory coolant type (Dexcool) and change interval? I also have a Land Rover Discovery and the opinion in that circle is that Dexcool after long intervals is responsible for various engine problems including headgasket failures. Opinions?

 

Long running thread with better choice if you search.... maybe on dexcool or try I think it's zerex

I don't think it's actually dexcool in our cars, though it's similar.

 

I did find a thread RE: types and mixing. My concern is really the interval. It seems that any coolant will change PH over time and become acidic. I intend to get some PH test paper and determine for myself. It seems 100,000 miles might be reasonable, but in my case that will be as much as 8 years or more.

 

You are correct. The 2005 Jaguars use Dex-Cool. Change at regular intervals. No the head gasket stuff is a myth. Don't mix coolants or you could get into trouble. My 2005 STR now has 72K miles with one coolant change and it's still very clean. When I had a pin hole leak in a heater hose I reused the Dex-Cool.
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