Flat tappet engines only require high ZDDP during break-in. There is no evidence they need it after that.
Ferrari dosen't have a different spec for older cars, does it? I know the "Ferrari spec" isn't a spec as such, only certain approved oils. But like Longlife-01 Isn't it back-specified to all models as was BMW "Special Oils" and Longlife-98?
As to the foaming, if that is a problem (and I don't know if it is) then I'd ask Ferrari about it. There's no way Helix is a "bad" oil that is the cause of the foaming. Helix is one of the finest motor oils on the planet.
Ferrari dosen't have a different spec for older cars, does it? I know the "Ferrari spec" isn't a spec as such, only certain approved oils. But like Longlife-01 Isn't it back-specified to all models as was BMW "Special Oils" and Longlife-98?
As to the foaming, if that is a problem (and I don't know if it is) then I'd ask Ferrari about it. There's no way Helix is a "bad" oil that is the cause of the foaming. Helix is one of the finest motor oils on the planet.