Hi everyone, I have an 04 Aztek running Pennzoil synthetic. I had blackstone check my oil on the last change and they confirmed coolant in the oil. I've been to the dealer twice regarding this issue and they are disputing that there is anything wrong and they do not see coolant in the oil. The dealer says that an INDEPENDENT lab analysis will not hold up with GM or GMPP(extended warranty)which makes no sense to me. The dealership was looking for some visual signs vs a scientific analysis. They rechecked and could not find a problem. They added a dye to find the leak. I took it in yesterday and again, no problem. Does anyone happen to know if coolant affects synthetic oil differently than conventional? I have been using synthetic. I was curious if it still shows the same symptoms such as white milky and whatever else?