what is the best atifreeze to use in a 99 ls1?
02-23-2008, 05:10 AM
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what is the best atifreeze to use in a 99 ls1? I am fixing to change my thermostat to a 160 and I am going to flush the radiator while I am at it. WHat atifreeze should I replace it with?
02-23-2008, 10:00 AM
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Since you just swapped the T-stat just use Dexcool. These cars used Dexcool from the factory and that's what I have always used in mine regardless of the setup. Even though it's considered an extended care product, I recommend to change it annually.
02-23-2008, 03:35 PM
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go green man!! when i flushed my system at 77k i had chunks of brown dexcool and there was corrosion in the cooling system because of dexcool! we use the green in all our cars now!! dexcool should be only used on the newer cars systems with the pressurized secondary tank!
