[Mgs] ZDDP again / STP

[Brian Boss]

Charles Navarro tested some additives in addition to oils the results are near the bottom of the page at the URL in my original message. Quoting from his site:
   
  Name Vis P (ppm) Zn (ppm) B (ppm) Detergents (ppm) API Date Type Source
  GM EOS Assembly Lube 5762 6221 8265 01/07 O/A Blackstone 
  STP Blue 1704 2436 88 11/05 O/A Staveley 
  STP Red 2115 3932 901 11/05 O/A Staveley 
  

Larry Daniels <ladaniels at sbcglobal.net> wrote:
           
  ----- Original Message -----   From: Brian Boss 
  To: Larry Daniels ; mgs at autox.team.net 
  Sent: Monday, September 03, 2007 10:22 AM
  Subject: Re: [Mgs] ZDDP again / STP

  

  My thinking is that there is nothing wrong with any decent oil except the reduced zinc level. The EOS product has around 50% more zinc so you can use less of it to get to the desired level. Also, STP claims to modify viscosity. If I have the correct weight oil for my application and change it before it breaks down, why would I want to modify the viscosity with an additive.
   
  I have never had a high opinion of oil additives in general. If whatever is in them had all the magic properties the makers claim, why wouldn't the oil companies put it in the oil to start with? Remember that "Slick 50" teflon based crap? In the case of the zinc additive, however, it is not some "snake oil" with wild claims. The additive is just to get back to the formulation of oil you could buy last year.
   
  Also, I believe there are at least 2 formulations of the Valvoline VR1. If it is rated SAE SM, or has the dreaded "energy saver" logo, I wouldn't use it.

=====================================
   
  Thanks, Brian, that is the info I was looking for.  
   
  I wrote directly to the makers of STP and didn't get a direct answer as to how much (ppm) of the zinc additive was in it -- only that it has 4 times the amount as what was originally in the motor oils before they cut way back.  Were you able to get that ppm number for both of these products?  Can you share it with us?  Thanks.
   
  Larry Daniels