Oil Detergent - Rislone ZDDP

[dbtenner]

Oil being used in my 1934 is SAE 40 straight weight from Shell Rotella. I’ve heard this detergent, Risolne (picture below) is a great zinc supplement detergent to add to the oil.

Any thoughts or review of this product?



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[51 MERC-CT]

The Shell Rotella appears to already have ZDDP in it.
The ZDDP is not a detergent but enhances lubrication.
If you do some research on line there are reports that say too much ZDDP can be detrimental to an engine.

[tubman]

You don't need it on a stock (or close to it) flathead.

[dbtenner]

Ok thanks! I didn’t realize Shell Rotella has ZDDP included.


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[A bones]

The need for zinc grew out of factory heavy valve spring, high lift, high performance camshafts. These street applications from early '60s thru the early '70s demanded higher zinc levels to insure valve train longevity.

While research shows some zinc is good, it also tells us that too much zinc can cause excess wear.

One of our senior gurus ( Ol' Ron ) speaks of spring pressure of about 45 or 50 lbs. ( I can't recall which ) as all that is needed.

[petehoovie]

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Wondering if ZDDP is beneficial to Babbitt bearings......Hmmmm

[flatheadmurre]

Originally Posted by petehoovie

Wondering if ZDDP is beneficial to Babbitt bearings......Hmmmm

ZDDP kinda needs to be activated by heat and pressure from 2 metalsurfaces to stick to them...so not harming bearing material...

[Gene1949]

Snake oil my friend. Oil companies spend billions of dollars formulating oil additives engineered by chemists. By using additives your are basically trying to outthink engineers who have spent their entire lives formulating additives. I know I'm not smart enough to do that.

Our engines were built and ran during a time when lube oils were very simple in design. About 2 and a half years ago went on the internet and looked for oils with the highest ZDDP package.
AT THAT TIME Castrol GTX 20-50 was rated in the top 5 unless you went to the designer "racing" oils. Having said that I'm sure that has changed by now. Anyway, all oils in the top 5 exceeded the ZDDP minimums necessary to protect old engines

[uncle buck]

Originally Posted by Gene1949

Snake oil my friend. Oil companies spend billions of dollars formulating oil additives engineered by chemists. By using additives your are basically trying to outthink engineers who have spent their entire lives formulating additives. I know I'm not smart enough to do that.

Our engines were built and ran during a time when lube oils were very simple in design. About 2 and a half years ago went on the internet and looked for oils with the highest ZDDP package.
AT THAT TIME Castrol GTX 20-50 was rated in the top 5 unless you went to the designer "racing" oils. Having said that I'm sure that has changed by now. Anyway, all oils in the top 5 exceeded the ZDDP minimums necessary to protect old engines

The problem today is the engineers and chemists are more focused on federal emission regulations than preventing wear on our old engines.

[40 Deluxe]

Originally Posted by uncle buck

The problem today is the engineers and chemists are more focused on federal emission regulations than preventing wear on our old engines.

Looking at the longevity of engines from the last 15 or 20 years(often 300-400,000 miles) I'd say what the petroleum engineers have done is to the benefit of our old engines! The only time extra zinc is needed is if we're running high RPM high pressure valve springs. Remember, there was no zinc in oil in the flathead's day!

[uncle buck]

Originally Posted by 40 Deluxe

Looking at the longevity of engines from the last 15 or 20 years(often 300-400,000 miles) I'd say what the petroleum engineers have done is to the benefit of our old engines! The only time extra zinc is needed is if we're running high RPM high pressure valve springs. Remember, there was no zinc in oil in the flathead's day!

We have also changed metals , gone to roller valve train ,variable valve timing, timing belts etc. The engines built today are every bit as different as the oils

[Karl]

Originally Posted by uncle buck

We have also changed metals , gone to roller valve train ,variable valve timing, timing belts etc. The engines built today are every bit as different as the oils

Agreed but there is no doubt the quality and functionality of todays lubricants is light years ahead of that used in the day. I have run restored BMC engines in cars for 50000 miles with no engine work . My mechanic grandfather spoke of the same engine in the day regularly needing a valve job at 10000 miles and the bottom end at 30000 miles Something has changed and in this case it isn't the engine -Karl

[Kurt in NJ]

When you add additional additives to oil with additives you can end up with something worse if the additives clash with each other

[V8 Bob]

The best advice I've learned about engine oil is if you think you need an additive, you're using the wrong oil!