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Hey guys. I was thinking about using auto-rx in my TL. it is a 99 and has 133k on it. I have all the bolt-on's now and I want to mkae sure it is running at its highest level. I have used either mobil1 full syn 5W30 or Royal Purple 5W30 for the past 3yrs. I believe their would still be some...

I bought some Purple Ice to eliminate hot spots. I have been reading here that it is not compatible with Prestone coolant, is this true? I have also read a lot of threads stating it will scum up my coolant. I wanted to see what the pros and cons would be for my car. I have Prestone 50/50 in...