[AT] STP

[Gene Dotson]

    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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