It doesn't look like the Berryman stuff is available 'round these parts unless by mail order, but how about the "Gunk" brand engine flush? I can get that at Advance Auto Parts stores. It's only a few bucks, so it's worth a shot!
If it is some crud clogging an oil passage, would that explain why the noise goes away when the car is warm?
Thanks for your time folks! I'll keep you up to date!
