GT is correct! have you ever pulled a motor apart that used penzoil youd never use that oil again . it looks like tar!!!
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Ya know, Ive always taken GTs advice....... I guess Ive never asked him about oil

And not to say I don't believe what you are saying, but when I usually drain it, its pretty clean still and last time the valve covers were off it was super clean inside. Now mind you, its a cruiser that spends its life around 3800 rpm and its only got 130 hours on it since 2004 lol. I have no problem making a switch though. Just stuck with it out of habit since Indmar told me to run it. Thank for the advice though, both of you.