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Originally Posted by Bror Jace
B@lliZtiK: " I just have my doubts about the effectiveness and useflulness of thicker oil like that in a car that probably won't see much high performance use. Simply to prop up a lifter tick problem, I don't think it's a good idea. Best to fix whatever causes that in the first place, IMO."
In general, I agree with you. High performance guys are often a bit too quick to go with a thick oil ... sometimes waaaayy too thick. 
Many serious car people have figured out that thinner oils provide less drag on the motor and free up more horsepower. And if you load up the oil with additives like moly, boron and ZDDP, you can get protection which is just as good ... sometimes even better. 
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My question to you would be, and you being the oil expert, you should have a good guess; at what point does oil become too thick or too thin to adequately protect. I know in part it relies on the clearances in the engine, but some size engines just simply shouldn't use above or below a certain weight oil due to hydrodynamic loads. I mean , can you conceivably cause excess bearing wear simply by using too thin an oil, or is that pretty much impossible. Is it also possible to cause wear by using too thick an oil and placing greater strain on the oil pump and bearings......