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ZDDP Content #5341653 02/05/20 10:11 AM
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Dennisfly Offline OP
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I have a Ford Model A with a 90 year old re-manufactured engine that has a low pressure oil system, flat tappets, and babbitt bearings. I want to add Zinc and Phosphorus.
I'm looking at three possibilities - ZDDPplus (about $10) , Riselone 3X Engine Oil Supplement (about $5), or STP Engine Oil Treatment(about $3). All three claim to contain ZDDP.

Where can I find out how much each contains and how much do I want in a five quart crankcase?

Re: ZDDP Content [Re: Dennisfly] #5341666 02/05/20 10:29 AM
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krismoriah72 Offline
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How about Valvoline VR1 or Rotella 10w30


Were oils 90 years ago high in Zinc and Phosphorus?

Re: ZDDP Content [Re: Dennisfly] #5341686 02/05/20 11:00 AM
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ragtoplvr Offline
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You valve spring pressure is so low (unless you hot rodded it) that you can run anything. A bigger concern is you have no oil filter. You do not want detergents, because you need to particulates to fall out of suspension into a nice sludge layer on the oil pan. In addition, some additives might attack Babbitt I think you want non-detergent mono-grade oil.

Rod.

Re: ZDDP Content [Re: krismoriah72] #5341688 02/05/20 11:00 AM
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Dennisfly Offline OP
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I'm using Rotella T4 15w40. The thinking among the Model A group is that modern oils are much better than those back in the day but, the removal of Zinc required for modern catalytic converters and the EPA is detrimental for old technology engines. I'm just trying to figure out if the $3 or $5 stuff that I can get at Walmart is sufficient, or if I need to buy the $10 stuff and pay to have it shipped.

Re: ZDDP Content [Re: Dennisfly] #5341691 02/05/20 11:02 AM
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ragtoplvr Offline
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Briggs and Stratton lawn mower oil would be a good choice as close the same technology as possible.

Rod

Last edited by ragtoplvr; 02/05/20 11:04 AM.
Re: ZDDP Content [Re: ragtoplvr] #5341698 02/05/20 11:10 AM
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Dennisfly Offline OP
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I hadn't heard about the additives attacking Babbitt. It seems to not be as durable as modern insert bearings. I do have an oil filter that is a modern add-on, not available in 1929.

Re: ZDDP Content [Re: Dennisfly] #5341713 02/05/20 11:37 AM
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Davejam Offline
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My understanding is Rislone 3X has:
15600 ppm Zinc
13400 ppm Phosphorus

I think this information might have come directly from a product data sheet, so look around and you might be able to confirm.
At the time I was looking this seemed to be the best option, but i don't have any info on the STP product.
Use this in a dilution calculation to get what you want.

Re: ZDDP Content [Re: Dennisfly] #5341726 02/05/20 12:04 PM
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A_Harman Offline
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Redline Engine Oil Break-In Additive seems to work for me....


2008 Dodge Ram 3500 diesel/G56
1985 Z51 Corvette track car 355/6-speed
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel/NV4500+GV
1972 GMC 1500 shortbed project truck 307/SM465
Re: ZDDP Content [Re: ragtoplvr] #5341761 02/05/20 12:30 PM
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CT8 Online Content
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Originally Posted by ragtoplvr
Briggs and Stratton lawn mower oil would be a good choice as close the same technology as possible.

Rod

The Briggs is a race engine in comparison.


2015 F150 2.7
2018 F350 6.2
Re: ZDDP Content [Re: Dennisfly] #5341881 02/05/20 02:13 PM
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PowerSurge Offline
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My uncle has ran SAE 40 oil with Rislone ZDDP additive in his model A for years. I know the engine has not been opened since at least the 1970’s. Just add the entire 11oz bottle.


1993 Porsche 964, 2001 Ford SVT F-150 Lightning, 2004 Chevrolet Corvette, 2018 Toyota Tundra and a few others
Re: ZDDP Content [Re: PowerSurge] #5341900 02/05/20 02:32 PM
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kschachn Offline
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Originally Posted by PowerSurge
My uncle has ran SAE 40 oil with Rislone ZDDP additive in his model A for years. I know the engine has not been opened since at least the 1970’s. Just add the entire 11oz bottle.

Which pretty much goes to show that no matter what you put in it, it will run. There's absolutely no reason for increased ZDDP in that engine, at least above what a normal oil would have. A good xW-40 oil would run just as well such as Mobil 1 0W-40. Or if you prefer maybe Delo 5W-40.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: ZDDP Content [Re: Dennisfly] #5341901 02/05/20 02:32 PM
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MolaKule Offline
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You might check with these guys and see what they recommend:

https://inrccca.org/product/classic-car-motor-oil/


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Re: ZDDP Content [Re: Dennisfly] #5341904 02/05/20 02:38 PM
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Chris142 Online Content
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They have not removed those addatives. They only lowered the amount in the oil. Still plenty for my jeep with flat tappits and all those 5.7 chevies running around. When the car was made did they even have addatives in the oil? Or did they just use a sae 20 or 30 mineral oil?


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87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
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Re: ZDDP Content [Re: kschachn] #5341906 02/05/20 02:42 PM
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Chris142 Online Content
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Originally Posted by kschachn
Originally Posted by PowerSurge
My uncle has ran SAE 40 oil with Rislone ZDDP additive in his model A for years. I know the engine has not been opened since at least the 1970’s. Just add the entire 11oz bottle.

Which pretty much goes to show that no matter what you put in it, it will run. There's absolutely no reason for increased ZDDP in that engine, at least above what a normal oil would have. A good xW-40 oil would run just as well such as Mobil 1 0W-40. Or if you prefer maybe Delo 5W-40.

Would a synthetic be ok for rope or leather seals?


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: ZDDP Content [Re: Chris142] #5341910 02/05/20 02:45 PM
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kschachn Offline
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Originally Posted by Chris142
Would a synthetic be ok for rope or leather seals?

It's interesting how people on hand decry that today's synthetics are just "highly refined" dino oils but then worry that they are going to damage something because they are synthetic.

A Group III base stock is chemically the same as a non-synthetic oil, right? It that worries someone then pick one with no Group IV or V composition.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
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