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3/16/16 2:54am - Reply: 'Re: Zinc Additive for Oils'
Tomtall
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Vette(s):
1973 Coupe -- 454 / 4 speed - Black on Black, Greenwood aftermarket turbo hood, Greenwood GTO style front bumper.American Racing Vector rims.

Joined: 3/5/2016
Posts: 43
F4Gary said:
Tomtall said:
sundevil74 said: Not sure where I read it (a few years back), but Shell's Rotella T in viscosity 15W-40 was recommended, especially for older engines.  It is designed primarily for diesel engines and trucks.  I've been using it ever since.  If I can find the article, I'll post it.



Use it myself. Got turned onto it by my son who builds 4 cylinder turbo engines. He gave it high ratings and said the import tunners swear by it. My Big Block likes it also.


I read somewhere that 10w40 weights and higher do not have to meet the lower zinc requirements for modern emission systems.

Shell took the zinc out of their oils just like everyone else though.



F4 - Well you got me thinking about your post regarding the fact that Shell removed the Zinc from their Rotella T series of oil so I did some digging on the net.. The most current post regarding this rumor about Zinc content was posted in 2014 by a gentalmen that asked Shell technical staff about the Zinc content of Rotella T series oils. They stated that the Zinc content had been REDUCED to 1200 ppm in their oil but was still twice the amount of regular API olis. There is a lot of discussion on the net about this topic so I guess the debate continues. I did read caution should be used running higher zinc level oils in vehicles with cats due to tge fact they can be damaged from the zinc but then those emmision engines shouldn't need the added zinc anyway. Thanks for your post F4 it stired the pot regarding this subject. The debat continues.
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3/16/16 8:52am - Reply: 'Re: Zinc Additive for Oils'
dwa175 Gold Member
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oakville, CT - USA

Vette(s):
1979 coupe and now 2007 c-6

Joined: 7/19/2014
Posts: 183
hi   if you are looking for  lucas oil products they are sold I auto zone stores     dwa

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3/16/16 10:19am - Reply: 'Re: Zinc Additive for Oils'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 870
On Shell Rotella T :

"Only the 15W-40 and 5W-40. Those grades are NOT bound to the <800 PPM standard to be rated as an SN. The 10W-30 is SN rated and that grade is required to have less than 800 PPM. The detergent levels in these oils are way higher to pass the CJ-4 qualifications. Detergents are polar molecules as is ZDDP. They fight for the same space and reduce the coverage of ZDDP on the extreme pressure loaded parts. This is why diesel oils have higher levels, they have to to provide similar protection."

That's post #638 of this thread:

http://www.corvetteforum.com/forums/c3-tech-performance/2484100-list-of-flat-tappet-oils.html

The next to last sentence is important.




|UPDATED|3/16/2016 8:19:41 AM (AZT)|/UPDATED|


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3/16/16 7:07pm - Reply: 'Re: Zinc Additive for Oils'
Tomtall
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Vette(s):
1973 Coupe -- 454 / 4 speed - Black on Black, Greenwood aftermarket turbo hood, Greenwood GTO style front bumper.American Racing Vector rims.

Joined: 3/5/2016
Posts: 43
F4 - Thanks for the links and info. Just goes to show your never to old to learn something new.
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3/25/16 7:45pm - Reply: 'Re: Zinc Additive for Oils'
alohajohn
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Vette(s):
1972 T Top, Mille Miglia Red, auto, ac, power windows, power steering, tilt/tele, power brakes, black leather..

Joined: 3/10/2013
Posts: 24
I had my engine re-built about 2 years ago and the guys that re-built it recommended I use only Brad Penn SAE 20W-50 oil as it has one of the highest levels of Zinc/Phosphorous on the market.
 
A minor word of warning, it's green in color and goes dark early...nothing wrong with that.
I don't live on the mainland but have no problems buying it here.

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3/25/16 10:16pm - Reply: 'Re: Zinc Additive for Oils'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 870
dwa175 said: hi   if you are looking for  lucas oil products they are sold I auto zone stores     dwa


$9.99 per quart!  Much cheaper from Summit.


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3/28/16 2:07pm - Reply: 'Re: Zinc Additive for Oils'
wetvet
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Lake Oswego, OR - USA

Vette(s):
1972 Steel Cities Gray T Top. Original Owner, Original Paint and Interior. The running gear has been rebuilt after 240,000 miles.

Joined: 10/17/2003
Posts: 540
I use 10-30 Castrol in my engine and ZDDP additive, that I purchase through Amazon.

http://www.amazon.com/ZDDPPlus-Engine-Additive-Phosphorus-Bottles/dp/B006LB70SW/ref=sr_1_1?ie=UTF8&qid=1459191813&sr=8-1&keywords=ZDDP

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3/30/16 9:01pm - Reply: 'Re: Zinc Additive for Oils'
tb2k82ce Lifetime Member
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Lemon Grove, CA - USA

Vette(s):
1982 C3 Collectors Edition 44000 miles, sat in the sun most of it's life, My wife purchased it for me for fathers day in 2007 from her girl friend that had it for 19 years. It is on the road again. I'm retired but it is now my daily driver.

Joined: 10/17/2007
Posts: 2007
This is what Pennzoil oils said in 2012.

An API SM rating will have the reduced zinc content (800-850ppm) while those such as the Pennzoil Outdoor Motorcycle Motor Oil in both SAE 10W-40 and SAE 20W-50 with the API SH will have 1100-1200ppm zinc.

Other oils containing higher zinc levels will be any oil with a diesel rating, API CI-4 or CJ-4.

The Shell Rotella SAE 15W-40 contains 1100-1200ppm zinc and Pennzoil Racing Motor Oil SAE 25W-50 has 1980ppm zinc.

I could not find any specification from Pennzoil on their products. 

One Pennzoil issue that is not reported much and I bet has not gone away is it depends on location the oil is manufactured to be sold in and the time of the year.  There are different additive packages for it so it is difficult to know what you are getting from Pennzoil.  I saw some test results from supposedly independent labs that show anywhere from 800ppm to 1800ppm for the same supposedly oil. 

Also Racing oils are designed for racing fuels not street fuels.  There is lots of different opinions on the harm or benefit of using Racing oils in street machines as the frequency of changing oils in a racer is a lot more than you want to do in your street machine.

Oh by the way I have read in a couple of oil forums that most sealant material used in pre-1992 engines does not like Synthetic motor oils.  Just thought I would through that into the mix.  I personally do not use synthetic oil in my 82.

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3/31/16 1:20pm - Reply: 'Re: Zinc Additive for Oils'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 870
Racing oils have less detergent in them.

Here is a website for the guys that are anal about their oil.  Some good info though.

www.bobistheoilguy.com



|UPDATED|3/31/2016 11:20:02 AM (AZT)|/UPDATED|


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3/31/16 2:39pm - Reply: 'Re: Zinc Additive for Oils'
johnu
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Eagan, MN - USA

Vette(s):
1981 Corvette Two-Tone Claret color, 4 spd, C7 Vert

Joined: 5/23/2007
Posts: 507
FYI, If you going to add a thick additive do it when changing oil and add it to say a 1/2 quart of oil or in my case a 5 qt container and shake it up to make sure it gets distributed.  If it's just poured in on it's own it's gonna just cling to the side of the block and flow to the bottom of the pan. 

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