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What about the 15?

What about 5w40 Valvoline Maxlife? Same price. Also says on the bottle that it's for high mileage, old engines.

According to the shop manual 10w40 is recommended too. But that's for oils 50 years ago and these were not the same. I'll probably get a 5w40 Helix HX7, thanks for all the help.

I'm not in the US, can't get that. And again, if I didn't want a cheaper, not "classic" alternative, I'd buy the usual Millers oil that's worked well for me. But thanks anyway.

I don't really see oils specifically marketed as heavy duty here in Europe. Full synthetic Valvoline 5w40 vs semi-synthetic 15w40 Shell Helix 15w40 Hx3 and Hx5 are both very cheap, there's also a HDEO 15w40 Shell Rimula oil for the same price as the Valvoline oils. Helix Hx7 5w40, other Shell...

Why exactly the other viscosities and not a 10w40?

I got a bit busy with life, sorry about the late reply folks. 1971 Ford 429 4V, stock cam. As far as I'm aware these had flat tappet cams. Spring pressures are 76-84 @ 1.810 according to the manual. The car is driven all year round and the temperatures range from -15C to 35C. Most people here...

I'm running an old flat tappet V8 so obviously I'm looking for a high zinc oil. But the question is, how do I actually find out the ZDDP of an oil? Will any multi purpose oil that's also meant for diesels work? I'm looking at 10w40. Can I just use a Shell Helix or a Fanfaro with the right viscosity?