Synthetic oil

I agree with you, P Kennedy, and I've always use synthetics in my vehicles. Watch any YouTube videos showing how much better they flow in cold temperature is enough to convince me. That being said, I oils have come a long way over the years and most people don't see the tdmperature extremes shown in the testing. That combined with better built engines and people trading in cars before there is major wear on the engine and conventional oil is probably ok for most. I tend to wait until around the 300000 k mark, so good oil is more important to me.