How to find out the ZDDP

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With the stock broomstick cam, you'd be fine with anything TBH. If you can get a Euro 5w-40 that's cheap, that's what I'd go with, or an HDEO even in a 15w-40, though a 5w-40 would be preferable.
Why exactly the other viscosities and not a 10w40?
 

Versus

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Typically, HDEO's and Euro oils are most abundant in the grades I mentioned (also 0w-40, but may be more expensive).
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 5w40s are available too.
 
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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 run 10w40 oil. I followed that and used Millers 10w40 for classics, the car seemed happy with it however I'm looking for a less overpriced option. Valvoline is available here, seems alright.
The Castrol I mentioned in post #4 would be perfect. Wally World has it.
 

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The Castrol I mentioned in post #4 would be perfect. Wally World has it.
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.
 

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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 5w40s are available too.
As @kschachn the Helix products are fine. I'd personally prefer a 5w-40, but any of those will work.
 

FCD

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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 run 10w40 oil. I followed that and used Millers 10w40 for classics, the car seemed happy with it however I'm looking for a less overpriced option. Valvoline is available here, seems alright.
-15C is a little cold to use a 10w40 in my opinion.

If you want a top notch 5W-40 with plenty of ZDDP, i would suggest Meguin SuperLeichtlauf 5W-40, it's essentially rebottled Liqui Moly Synthoil 5W-40, has +70% PAO in it and 1200ppm of ZDDP.
 

FCD

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Or Mobil 1 FS 0W-40 would also work just fine, it will flow without a problem at -15C, has around 1000ppm of ZDDP which is enough, and is more widely available than the Meguin SLL, although it is a rather thin 40 grade, wouldn't that old 429 have called for 10W-30 anyway?
 
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Been using Mobil 1 15w-50 for over 20+ years in many different classics; including ‘66 Shelby GT-350’s, various ‘60’s era Ford 289’s / 302’s / 390’s / 428’s, Jaguar e-types, Triumph TR-4 , 4a’s , just to name a few. Also recommended is Mobil 1 0w-40 & 5w-40. All of these mentioned will have a minimum of 1000 ppm zinc / phosphorus (zddp) with the 15w-50 having 1300 ppm zinc & 1200 ppm phosphorus. Plenty for flat tappet engine protection.

of the engines mentioned that have been checked, they have shown zero measurable wear after 50,000 to 80,000 miles of severe duty usage.

Z
 

FCD

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Been using Mobil 1 15w-50 for over 20+ years in many different classics; including ‘66 Shelby GT-350’s, various ‘60’s era Ford 289’s / 302’s / 390’s / 428’s, Jaguar e-types, Triumph TR-4 , 4a’s , just to name a few. Also recommended is Mobil 1 0w-40 & 5w-40. All of these mentioned will have a minimum of 1000 ppm zinc / phosphorus (zddp) with the 15w-50 having 1300 ppm zinc & 1200 ppm phosphorus. Plenty for flat tappet engine protection.

of the engines mentioned that have been checked, they have shown zero measurable wear after 50,000 to 80,000 miles of severe duty usage.

Z
M1 15W-50 is not available on this side of the pond 😢 only in the Racing 4T Motorcycle version, i curse Exxon Mobil for not selling the vanilla M1 15W-50 over here, i'd buy it in a heartbeat.
 

Versus

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Or Mobil 1 FS 0W-40 would also work just fine, it will flow without a problem at -15C, has around 1000ppm of ZDDP which is enough, and is more widely available than the Meguin SLL, although it is a rather thin 40 grade, wouldn't that old 429 have called for 10W-30 anyway?
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.
 

Versus

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HX7 has about 1000-1100ppm of Zddp, not super high but enough for a stock flat tappet cam, should work just fine.
What about 5w40 Valvoline Maxlife? Same price. Also says on the bottle that it's for high mileage, old engines.
 

FCD

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The 5W-40 Maxlife seems to have a slightly lower Zddp than its 10W-40 sibling, about the same as the HX7, Maxlife does have more moly, about 200ppm iirc, it would be a good choice too.
I've used the 10W-40 Maxlife in a couple cars and it definitely dampened noise and lowered oil consumption in both of them, haven't tried the 5W-40 version.
 
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why bother with mediocre zddp, if you can smear tungsten on it ?
 

Versus

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The 5W-40 Maxlife seems to have a slightly lower Zddp than its 10W-40 sibling, about the same as the HX7, Maxlife does have more moly, about 200ppm iirc, it would be a good choice too.
I've used the 10W-40 Maxlife in a couple cars and it definitely dampened noise and lowered oil consumption in both of them, haven't tried the 5W-40 version.
What about the 15?
 
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