I have an 01 3.1L Chevy motor and I am concerned about all the information in regards to the leaking intake manifold gaskets. I would like to know if there is an inexspensive test for checking for coolant contamination in the oil? I use Pennzoil 5w-30 and Wix oil filters every 3-4k since new and have seen no sign of coolant on the dipstick or under the oil cap. I just dont want to find out right after the warranty is up that I should have had the dealer change the gaskets. The motor has 31k trouble free miles on it right now and warranty is up at the end of this May. Thanks for any info!