[AT] STP

[Larry D Goss]

We've been around and around the STP question on another tractor list. 
We're not concerned about using it in engines as much as we are for 
transmissions.  If you look through the writings that the company puts out, 
they don't recommend anywhere that it be used full strength.  Somewhere in 
the material, they say to use it at a maximum strength of 50%.  What I'm 
doing is mixing it half and half with 80-90 hypoid oil.  It does wonders for 
quieting noisy gear trains.  I'm using it as a substitute for a special 
blend that includes STP, gear oil, and Bentonite.  One of the concerns of 
using STP in cold climates is the problems of flow at low temperatures. 
Apparently that's one of the reasons for the 50% maximum concentration 
level.  Don't ask me what the real blend is supposed to be.  It's one of 
those trade secrets like the recipe for Coca-Cola.

Larry

----- Original Message ----- 
From: "Gene Dotson" <gdotsly at watchtv.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Sunday, February 25, 2007 1:06 PM
Subject: Re: [AT] STP


>    John has some good comments. STP is primarily a polymer viscosity 
> improver, which mainly thickens the oil. I would think a more satisfactory 
> temporary solution would be to use a 15-W-40 oil. With a block heater you 
> will not have a problem cranking in very cold weather.
>
>    Bottom line is that the bottom end is getting a lot of wear and 
> allowing the oil pressure to escape through the main bearings, rod 
> bearings and camshaft bushings. I know you already know this and looking 
> for a solution till warm weather comes to do a proper job.
>
>    You may want to try a known good pressure gauge to eliminate the 
> possibility of a defective gauge.
>
>                        Gene
>
>
>
> ----- Original Message ----- 
> From: "John Grant" <jfgrant at zoomon.net>
> To: "Antique tractor email discussion group" 
> <at at lists.antique-tractor.com>
> Sent: Sunday, February 25, 2007 1:34 PM
> Subject: Re: [AT] STP
>
>
>> Hello Ralph. In repy to your STP question. Think about it for a minuet. 
>> Higher oil pressure with an additive means thicker oil. This does not 
>> replace worn metal. Are you after just higher oil pressure or a cheep 
>> overhaul? A ok temporary fix but not for long haul. In My Opinion.
>> As cold as it gets around your barn I wouldn't think you'd want thicker 
>> oil! Grin/Grin.
>> I guess I'd look at the oil pump first. See what it's output and pressure 
>> is. Is it adjustable like the John Deere's are?   No easy fix like a 
>> poptop!.  jg
>> ----- Original Message ----- 
>> From: "Ralph Goff" <alfg at sasktel.net>
>> To: "Antique tractor email discussion group" 
>> <at at lists.antique-tractor.com>
>> Sent: Sunday, February 25, 2007 1:00 PM
>> Subject: [AT] STP
>>
>>
>>> Not sure if I may have asked this question before but I'm wondering 
>>> again, how many , if any of you, use STP oil treatment in your old 
>>> tractor engines? The reason I ask is that my Cockshutt 40 has lower oil 
>>> pressure than I like to see. It seems to be gradually dropping as the 
>>> years go by even though the engine is excellent and burns no oil. At 
>>> full throttle running the snowblower it has oil pressure reading just on 
>>> the line between normal and low. It used to be up in the o to r part of 
>>> the word normal a few years ago. I don't know if the oil pump is wearing 
>>> out or bearing clearances are increasing. I do regular oil and filter 
>>> changes and have always used the same 10w-30 oil since the engine was 
>>> rebuilt some 27 years ago.
>>> I'm wondering if some of that good thick STP oil treatment might 
>>> increase the oil pressure or at least provide improved lubrication to 
>>> compensate for the lower oil pressure?
>>> Just looking for opinions here.
>>>
>>> Ralph in Sask.
>>> _______________________________________________
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>>> http://www.antique-tractor.com/mailman/listinfo/at
>>
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