rgnoon Posted November 23, 2005 Report Share Posted November 23, 2005 Am reading around randomly, and after finding some answers to the oil question...I am wondering about coolant additives or suppliments for a high mileage 4.9. Any thoughts, suggestions?? Thanks. Ryan Link to comment Share on other sites More sharing options...
Ranger Posted November 23, 2005 Report Share Posted November 23, 2005 Just use the cooling system suppliment (sealant tabs) as recommended by GM, nothing else. Link to comment Share on other sites More sharing options...
KHE Posted November 23, 2005 Report Share Posted November 23, 2005 To add to Ranger's post, do not use long life silicated coolant in your car as it contains too high of concentration of silicates which will erode the water pump seal and can gel in the heater core. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
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