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So, if I go with the VR1 (conventional) for my stock 340-S...should I use 10W30 or 20W50? Again, car is only driven from April - Nov. Summer gets pretty hot here in L.I., NY!

what about this? http://www.z-alt.com/index.html

Are we all referring to the VR-1 (conventional dino crude) 10w30? That's what I've been using. Not the "not for street..." stuff.

http://www.joegibbsdriven.com/products/hotrod/hr2.html ?

I own a 1968 Barracuda Formula 340-S, auto. (orig. flat tappet cam). 127k on original motor. Been using Valvoline VR-1 (10w30) for past 2 seasons... April-Nov, depending on weather on L.I., NY. Heard about Brad Penn, checked their site and was thinking of switching this spring. Should I? What...

What about Joe Gibbs oil? Should I go full synthetic?

Thanks to all. Again, relying on all of you "oil" experts. Just want to put right oil in to preserve orig. motor for as long as possible. It's a #'s matching car...want it to stay that way. Without price as a factor, which one wins the vote?

Car is torqueflite 727 auto. Funny you mention 20w50, because that is what my mechanic (ex Mopar dealer employee) recommends. What is correct?...10w30, 10w50, 20w50... Car sits in unheated (detached) garage all winter and is out spring to late fall. Thanks.

Worried about Zinc levels. Friend of mine blew his GTO motor cause of "wrong" oil.

More about protection than price as I do only one oil change per season.

I own a 1968 Barracuda Formula 340-S (orig. flat tappet cam). 127k on original motor. Been using Valvoline VR-1 (10w30) for past 2 seasons... April-Nov, depending on weather on L.I., NY. Heard about Brad Penn, checked their site and was thinking of switching this spring. Should I? What oil is...

Just spoke to tech. at Valvoline. He suggests VR-1 (higher zinc). Said he remembers (losing) to many Mopars, back in the day!

So it looks like Valvoline Maxlife 10w30 seems to be the choice. No need to worry about the ZDD issue? Thanks to all. And thanks to 440Magnum for the welcome! Will post pics of car ASAP.

Thanks, but this is original (never rebuilt) motor. What did you use before rebuilt? Also, mine is a stock 340.

Hey- I have a '68 Barracuda Formula-S 340. All original matching #'s. 123,000 on motor. Want to change oil, but don't know what grade/weight to use. I'm in Long Island,NY and car is stored for winter. When I bought the car in May'07, the previous owner had just changed oil...said he used...