Silvermax, hope your still above ground, if not condolences to whoever is reading this. I found your article beyond fascinatingly , sorry I didn't get back sooner. I knew most of what you were saying, but I did fall for the trick that 93 has better detergents and cleaners, in fact the book for that Larado literal says to put H/0 to clean your pistons. I like old great cars and just bought the wife a 92 jeep larado.I find your articles compelling and complete, plus I learned something. Would love to talk to you more, knowledge is power. I don't do this normally but if you ever want to talk Oil- and gas please call 864764-8211, how often do you get to talk to someone in the industry who is truthful? Seriously, I'm up from 0:600 to 0:300 EVERDAY, I'm retired also.Bored also.