I get Pep Boys 10w-30, change it every 3000 miles with a Fram filter. Why Pep Boys? Because its cheap and I believe its actually non-branded Havoline, if I'm not mistaken.
I believe your right. I remember a friend of mine that worked in the service garage at the local Pep-girls telling me something like that. There's nothing wrong with havoline but still need the Zinc additive. It's very important for engine that have flat tappet cams.
All engines manufactured now are roller cam and even equipped with roller rockers. theres no need for the extra protection of the zinc because of the roller setups. plus, the zinc causes problems for the catalytic converters. That's why they have reduced the amount of zinc in oil to nearly none!
