<VV> Best Oil and STP

[kevin nash]

> Message: 3
> Date: Wed, 4 Jan 2012 17:24:24 -0600
> From: "J R Read" <hmlinc at sbcglobal.net>
> Subject: Re: <VV> Best Oil & STP
> To: <BobHelt at aol.com>, <jay.pitchford at gmail.com>,
> 	<virtualvairs at corvair.org>
> Cc: Mlevair at sbcglobal.net
> Message-ID: <C7FD2F9BBB004D90881FBFE4480968C8 at OFFICEDELL>
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> 	reply-type=original
> 
> Odd that the oil topic came up just after a little "experiment" at work.
> 
> A few days ago, one of the guys had Regular oil 5W30, Mobil1 5W30, A bottle 
> of STP and a flat edge (relatively heavy) screwdriver.   He dipped the blade 
> of the screwdriver into each and had several of us (taking turns and 
> cleaning hands and screwdriver each time) holding the screwdriver tip 
> between thumb and forefinger with palm above and handle of screwdriver 
> hanging down.  Easy to do with nothing on the blade AND with oil on it AND 
> with Mobil1 on it.  But, even though it was more viscous to the touch, it 
> was virtually impossible to keep the screwdriver from falling when it was 
> dipped into the STP.
> 
> Now, this makes me think that it might be a good idea to add some (how 
> much???) STP at oil change time.  I looked at their web site and could not 
> find any specifications for STP.  I was looking to see if there was a 
> statement about ZDDP content, but was unable to find anything.
> 
> Does anyone on VV have a clue as to ZDDP content of STP and what would be an 
> appropriate ratio of oil (either type) to ZDDP if adding at oil change time. 
> I'm not condoning this, just trying to investigate at this point.
> 
> Thanks.
> 
> Later, JR
> CCE CORSA CORVANANTICS SCG member
> '61 Rampside Standard 4/110
> '65 Monza Convertible 4/140
> "Keep the Love Alive"
> 
  JR- Stp does have ALOT of zddp in it- something like 1900 ppm- I read this on the "bob is the oil guy" website. Somebody on that website sent a sample of stp to a oilanalysis place to get that information. I'm not too thrilled about using Stp for zddp enhancement (although I have tried it in the past for that reason), as it does thickenthe oil quite a bit. Probably, the best way to use that stuff is to run a somewhat thinner than recommended oil viscosity, and then add enough stp to bring it back to a somewhat normal viscosity. To do that is alot of experimenting! I seem to recall running 1/4 of a bottle of Stp with 10w-40 (may have been 10w-30) without a noticeable viscosity increase. I did not "measure" the viscosity change, I did pay attention to the oil pressure (hot and cold, before and after adding stp), and also checked how thick the oil felt after adding some stp. Obviously not very scientific! I think the zddp issue for a stock corvair is overblown- they were designed to run on oil that had low levels of zddp, and those levels were the same or less than the modern synthetic oils.Kevin Nash