Rizlone ZDDP additive
 

There has been more than several threads about the newer oils and their lack of zink. I saw ths product on ''Truck U'' the other day being advertised. It's advert claims to add all the zink needed for our ''older engines'' according to them. Has anyone tired this product inour cars or have some thoughts ???? :confused:

Re: Rizlone ZDDP additive
 

I have been adding 1/2 a bottle of ZDDP w/ each oil change. I did a quick calculation and determined 1/2 bottle w/ whatever level of zincphosphate present in current Mobil 1 formulation would bring the total to about 1200 ppm.
Ofcourse, I have no idea as to what is really in ZDDP... Only could go by what they claim.

Re: Rizlone ZDDP additive
 

Is that the Rislone brand you are using or something else?

Re: Rizlone ZDDP additive
 

Is it more economical than buying $10 qts of zddp amsoil? 10w-30 M1 by the walmart jug is quite a deal, really.

Also, I'd prefer slightly less levels to find a nice compromise to keep the cats healthy.

Re: Rizlone ZDDP additive
 

FWIW I use GM's as per Marc Haibeck.

Re: Rizlone ZDDP additive
 

No. This is what I have been using.
http://www.eastwood.com/zddp-plus-oi...e-4-fl-oz.html
2 oz fater an oil change.

Re: Rizlone ZDDP additive
 

The LT5 was designed for API SG oil. It is noted on the oil filler cap of the 1990 to 1992 engines. SG has .12% ZDDP. This is also specified as 1200 ppm ZDDP. Modern oils like Mobil 1 10W-30 have .08% ZDDP. They are removing ZDDP because it can reduce the efficiency of the catalytic converter. In the future they might remove more ZDDP.

This is a minor issue with the LT5 because the smaller valves have lower loads on the lifters. The LT5 load on the lifter at full lift is 248 lbs. The L98 with flat tappets has a lifter load of 375 lbs.

I have observed that the lifters wear more than the cams on the LT5. On the LT5 the main concern is lifter wear. Camshaft sprocket wear is also a factor. ZDDP is used to protect these parts.

The easy way to address this is to use an oil that is formulateded for older design engines with flat tappets. The Amsoil AMO product and many other products are available. These products have .12% ZDDP. Too much ZDDP can cause a problem too. The .12% level was used from about 1965 to about 1995 and is well proven.

Amsoil AMO is priced about the same as Mobil 1 if you sign up as a Preferred Customer. Since Amsoil AMO is a higher quality lubricant than Mobil 1 you could go an additional 1000 miles more than you would with Mobil 1.

If you want to save a few dollars you could use GM EOS as an additive for modern oil. About half a bottle of EOS will increase nine quarts of .08% ZDDP oil to about .12%.

If you are subject to emissions testing, modern oil might be right for you. Longer catalyst life might be as important and less lifter wear. Lifter wear due to reduced ZDDP seems to me to be a minor issue on the LT5.

Re: Rizlone ZDDP additive
 

How about the Mobil 1 Extended Performance?

Re: Rizlone ZDDP additive
 

Re: Rizlone ZDDP additive
 

Mobil 1 product guide[ATTACH]1369