Synthetics vs conventional
I looked at the price difference of say regular oil and good stuff like rotella made by shell, you can do 2-3 oil changes with the regular stuff. the popular opinion of with synthetics you will get greater mileage hence less changes and may even be more cost effective but why blue selectively apply the logic of marketing spiel to other parts and not oil because most of the belief is founded on manufacturers claims.
Let's face it. 10k on regular vs synth the oil is going to be black as tar. are there any anecdotal experience from soneone without an agenda sending in their oil samples and getting it tested? My point is after 10k the oil is still lubricating may be a little less than synth but is isn't like no oil at all.