High Zinc (ZDDP) Engine Oil: My 2 cents - Page 2 - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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post #16 of 24 Old 08-07-2019, 07:47 AM
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Re: High Zinc (ZDDP) Engine Oil: My 2 cents

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Originally Posted by beaner2u View Post
Gentelmen,

There is no wonder product that can cure abuse, the abuse of neglect of not changing oil frequently, the erroded metal in important places; and/or the self-inflected abuse of pumping unflitered oil right back into a crank pin, aka low volume oil pump system.

Whatever or however the abuse a tractor incurred thrity to sixty years ago cannot be corrected buy a traveling salseman promissing a mircle cure in a bottle. His miracle juice may 'fill' a void temporaly, but metal worn away, is metal worn away.

A full-flow oil filteration system was one of Gravelys greatest improvements. No more junk pumped right back into the crank pin, drive pinion bushing, and sun gear. Unfortunely the conversion kits from low to high volume are no longer available. The conversion with the proper parts from donner tractors is doable, but it is a complete tear down and splitting bottom cases. The oil pump drive gear shaft has to be changed.

Roger,
Roger,
Just for my understanding: I realize the low-volume setup was not the best in regards to filtering the oil but would this old way of filitering still not be loads better that the Kolher's that replaced the Gravely-made engines that had no oil filter?

arnoldir,
There have been lots of internet fights discussing the almost taboo subject of types of oil to use - there is a loooonnngg one one of the Porsche 911 forums that continues to live after years of discussion, rants, accusations, outright lies, and, occasionally, even some truth appears in the mixture! As those older 911's are air cooled and use flat tappets the zinc content is often THE topic. I owned a 911 and used Mobil-1 synthetic 15W-50 (the synthetic versus conventional oil is a whole other argument). When I changed my car's oil, this little car took 13 quarts (yes, 13!). In regards to what I use in my four Gravelys - I have exclusively used Rotella synthetic 5w-40 and regular Rotella 15w-40. I mix this at approximately 30% synthetic and 70% conventional Rotella. There was a well-versed and highly knowledgeable tribiologist that had reported that a 20% mixture of synthetic will provide 80% of the overall benefit of synthetic. One Gravely of mine that I put a LOT of hours on each year and I can vouch that in regards to lubrication, the Rotella does wonderful job - I have not seen an air-cooled motor run so cool especially in these hot Alabama summers. But, in my opinion, as long as you keep the oil level at the full mark and change it on a regular basis, you will not have any oil-related problem with these fine and rugged machines!

Daryl G

1957 Gravely L
1974 Gravely C8
1973 Gravely CI
1967 Gravely C8
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post #17 of 24 Old 08-07-2019, 09:07 AM
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Re: High Zinc (ZDDP) Engine Oil: My 2 cents

Well stated Fireant!!
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post #18 of 24 Old 08-07-2019, 09:50 AM Thread Starter
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Re: High Zinc (ZDDP) Engine Oil: My 2 cents

Reply to TobyU,

I purchased and am using the Bottled and ready to go Lucas Hot Rod And Custom 10 -W 30 Motor Oil, not the break in additive.

Per the Zinc-Values.pdf on their website: they have much higher ZDDP levels in the marine and racing only oils.

Marine Engine Oil 2- W-50 3,123 PPM

Racing Only Oil between 3K and 6K PPM.
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post #19 of 24 Old 08-07-2019, 10:25 AM Thread Starter
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Re: High Zinc (ZDDP) Engine Oil: My 2 cents

Reply to nhgravely and Fireant911,

Thanks for your input, I appreciate your time taken to post and move the discussion forward.

I have read through some of the Zinc "discussions" in other forums and knew going in that it is a hotly debated subject.

It was not my intent to upset the apple cart, just to get my thoughts and research info up here so it might be useful to someone.

To everyone else who posted up, I also thank you for your time and effort as all input is appreciated.

I hope everyone has a good rest of the summer, and smooth mowing to all.

Regards
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post #20 of 24 Old 08-07-2019, 10:40 AM
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Re: High Zinc (ZDDP) Engine Oil: My 2 cents

I think I have said this before (on the forum) don't ever discuss religion or politics with your wife/girlfriend/relatives. So the same goes for talking about oil (or filters) on forums on the web.
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post #21 of 24 Old 08-07-2019, 05:03 PM
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Quote:
Originally Posted by nhgravely View Post
I think I have said this before (on the forum) don't ever discuss religion or politics with your wife/girlfriend/relatives. So the same goes for talking about oil (or filters) on forums on the web.
It's always best on those subjects to just state the facts and not opinion and never opinion as if it is fact.

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post #22 of 24 Old 08-08-2019, 07:05 PM
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Re: High Zinc (ZDDP) Engine Oil: My 2 cents

"Roger,
Just for my understanding: I realize the low-volume setup was not the best in regards to filtering the oil but would this old way of filitering still not be loads better that the Kolher's that replaced the Gravely-made engines that had no oil filter?
arnoldir,"

There is a big difference between the oiling system of Gravely engine and a Kohler engine.

A Kohler engine does not share chassis lubrication, a Gravely engines does. A Kohler engine uses something less than one quart of oil kept in its bottom oil resivor. Kohler uses a 'dasher' on the bottom of the connecting rod to splash oil around in the bottom end and cylinder walls.

A Gravely engine uses five pints of oil. The low volume oil pump system pumps oil from the bottom of the chassis into the crank pin, drive pinion bushing and sun gear in the high/low planetary assembly. Oil that may have picked up some debris during an attachment change, oil that is sucked up through a piece of screen door screen and then pumped right back into the main engine componet, the crankpin. The spinning flywheels spread oil to the rest of the engine internals.

The high volume oil pump system still picks up oil from the bottom of the chassis, but through a much finer pickup screen; it is then pumped into a full-flow oil filter, and then to the crankpin, drive pinion bushing, and sun gear.

But even with the high volume system I have seen abuse. Water in the chassis will rust the pickup screen and allow nasties to enter the system. The oil breather cap was stuffed with aluminum shavings, I have found those shaving inside the high volume pickup screen and into the oil lines.

Roger,

Faux Pas are my forte
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post #23 of 24 Old 08-08-2019, 10:20 PM
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Re: High Zinc (ZDDP) Engine Oil: My 2 cents

Clean oil is better than dirty oil, any grade or brand of oil is better than no oil. Its that simple. I just use any brand grade 30W in summer or 5-30 or 10-30 in winter. If there is a problem burning or using oil use 15-40. As for snake oil additives that is what they are. The only thing they do is remove money from your pocket.
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post #24 of 24 Old 08-09-2019, 09:35 AM
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Re: High Zinc (ZDDP) Engine Oil: My 2 cents

Another good post!
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