STP Blue Bottle

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Well the oil pressure on the ol F150 has been slowly dropping. I recall when I first installed the mechanical gauge in 93 that I was getting around 40 psi at 2000 rpm hot. The other day I was driving her hard and the pressure was around 32 at 2000, so I stopped at an auto parts store and got some blue bottle STP engine treatment and dumped it in. Instantly boosted it to 40 psi. That stuff is about 200+ cst viscosity vs the oil being about 12.5 cst, so now I am running somewhere just under 16 cst. Should have used the Valvoline Synpower additive but not sure that is made any more. But from now on this truck will run 10w30 winter and 10w40 with a quart of 20w50 added to it for summer.
 
Isn't the 'rule of thumb' 10psi per 1k rpm?

That would mean that your OP would still be good if you had 20psi @ 2k rpm - you had way more than that at 32psi.
 
Understand totally....I still LOVE pouring oil into an engine...gak! Are we weird or what!?!?!
 
Yes, my favorite part of the oil change is refilling the crankcase. Opening the drain is pretty nice too if you have a Fumoto or Fram Sure-Drain valve.

We may be weird but it helps keep us out of trouble.
 
Originally Posted By: steve20
"""We may be weird but it helps keep us out of trouble."""

This should b e on BITOG's banner page


HA! I agree, +1!!!
darthmaul.gif
 
Originally Posted By: TallPaul
Well the oil pressure on the ol F150 has been slowly dropping.... so I stopped at an auto parts store and got some blue bottle STP engine treatment and dumped it in. Instantly boosted it to 40 psi. That stuff is about 200+ cst viscosity vs the oil being about 12.5 cst, so now I am running somewhere just under 16 cst.


Wow, so is this right, one bottle of STP blue will raise the oil grade by about one notch?

I'm considering putting in either a whole or 2/3 a bottle into a 5w30 oil for a car to be used in NE climates where 20F temps are common and even some rare dips below 10F might possibly happen (fairly unlikely though) for when the car needs to be started up. Would this make it too thick for an oil burner which has somewhat wider piston / cylinder tolerances than a normal car
??
 
Originally Posted By: steve20
Paulie
You have committed a mortal sin by using the STP goop


LOL there was a time where it was the #1 oil additive in the world. I don't know what the stats are now, but I bet it is still up there. It did help oil burners a little.
 
Originally Posted By: demarpaint
Originally Posted By: steve20
Paulie
You have committed a mortal sin by using the STP goop


LOL there was a time where it was the #1 oil additive in the world. I don't know what the stats are now, but I bet it is still up there. It did help oil burners a little.


at the time it was #1---were there any other oil additives on the market? I was too young to remember anything more than the metal flip top STP can
 
Last edited:
Originally Posted By: steve20
Originally Posted By: demarpaint
Originally Posted By: steve20
Paulie
You have committed a mortal sin by using the STP goop


LOL there was a time where it was the #1 oil additive in the world. I don't know what the stats are now, but I bet it is still up there. It did help oil burners a little.


at the time it was #1---were there any other oil additives on the market? I was too young to remember anything more than the metal flip top STP can


Yes, a few in fact, although not as many as today. Some that come to mind are Wynns [I forget the product name], Casite Motor Honey, Risoline, Restore, MMO in metal cans, a few flushes, Slick 50 but that was later on, something or other from Mil-Tec, to compete with Slick 50, etc. My brain is a bit sluggish this morning, I'm sure some of the older members can chime in and help me out.
 
I would have added some thicker oil rather than STP. STP use to mean "Studebaker Testing Products". People would use it to sell the car or pass inspection. But than was when the Ford 289 engine was all the rage.
 
It probably didn't help STP that they were sued twice by the FTC 1978 and I think in mid 1990's for making false product claims.

Pretty sure, the mid 70's action probably was the biggest nail in the coffin for them.
 
Originally Posted By: Letter_K
It probably didn't help STP that they were sued twice by the FTC 1978 and I think in mid 1990's for making false product claims.

Pretty sure, the mid 70's action probably was the biggest nail in the coffin for them.



And it had the slogan "The Racer's Edge"
probably sat in a bottom corner of the oil pan for many drivers
 
It used to make a good assembly lube.
I have also used it to squeeze another few thousand miles out of a terminally worn engine.
 
Although it doesn't have as many additives in it as it used to, I still think it's a good product, that does exactly what it says it will - thickens the oil by one grade, and bump Zn/P numbers into the API SL-spec range.

Despite legal actions against it, etc.... it still sells really well, AFAIK.
 
I remember when it came in a can and you pulled a flip top lid to open the entire container. You had to use it all, since it could not be closed back up and saved for later use.

A one shot deal....

They use to sell a lot of it and people would buy "Gunk" engine flush in the can, to clean out their engines after repeated uses of the engine treatment. Problem was the "Gunk" in a can looked remarkably similar to the Old Quaker State Oil cans.

I have only seen the STP engine treatment sold, on a retail level, at Kmart for around $3. I guess it might also be found at other stores, on occasion, like Big Lots, Dollar General and some auto parts stores.
 
Originally Posted By: mongo161
I remember when it came in a can and you pulled a flip top lid to open the entire container. You had to use it all, since it could not be closed back up and saved for later use.



IIRC that can was designed to be squeezed into a "V" shape and used that way to pour the stuff. People would heat up a pot of water and put the can of STP in the hot water to get it to pour. If STP was left out in the garage during the winter pouring it into an engine could take a vvvvvvvvvery long time. Pouring it into a hot running engine after putting the can of STP into a hot pot of water was the fastest way to get it into an engine. LOL
 
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