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Stp and oil viscosity #4758618
05/16/18 10:01 AM
05/16/18 10:01 AM
Joined: Jan 2011
Posts: 1,045
Columbus Nebraska
old1 Offline OP
old1  Offline OP
Joined: Jan 2011
Posts: 1,045
Columbus Nebraska
Now I know many, probably most of you have no use for Stp oil treatment. But I still would like to know if I were to put one 15 oz bottle in 4 quarts of 10w30 conventional or semi synthetic oil, what would the equivalent viscosity of the mix be. Approximately, not precisely. Would it be like a 15w40, a 20w50, or something odd like a 15w 35????


2017 Nissan Frontier 4.0 5w30
1965 Mustang 200 c/4 10w30 QS defy
1964 Ford Ranchero 302 c/4 15/40 Delo
1929 ford model A No filters, and 15/40 oil
Re: Stp and oil viscosity [Re: old1] #4758636
05/16/18 10:19 AM
05/16/18 10:19 AM
Joined: Jan 2016
Posts: 820
NC
Vladiator Offline
Vladiator  Offline
Joined: Jan 2016
Posts: 820
NC
The viscosity would be 10w30, with a gob of STP floating in the pan. Many tests on YouTube show that STP does not dissolve/mix in oil, so it would have no way of affecting the viscosity.


2000 Lexus GS300-361k
1999 Lexus GS400-213k
2006 Toyota Camry-187k
2006 Toyota Highlander Hybrid-125k
2009 Scion xB-120k
2013 VW Tiguan-120k
2009 Toyota Tacoma-60k
Re: Stp and oil viscosity [Re: old1] #4758667
05/16/18 10:53 AM
05/16/18 10:53 AM
Joined: Feb 2016
Posts: 686
NJ, USA
MotoTribologist Offline
MotoTribologist  Offline
Joined: Feb 2016
Posts: 686
NJ, USA
It absolutely is miscible in oil.

15 oz. of that product to 4 quarts should still be an SAE 30 unless the starting viscosity of the 10W-30 was at the upper range of the spec. In that case it would be a low SAE 40.

Re: Stp and oil viscosity [Re: old1] #4758685
05/16/18 11:11 AM
05/16/18 11:11 AM
Joined: Jan 2011
Posts: 1,045
Columbus Nebraska
old1 Offline OP
old1  Offline OP
Joined: Jan 2011
Posts: 1,045
Columbus Nebraska
So you are saying that adding approximately 12% of a product with as high of a viscosity as STp oil treatment will barely affect the viscosity of the original oil. What if I added one quart of 20w50 oil to the same 10w30??


2017 Nissan Frontier 4.0 5w30
1965 Mustang 200 c/4 10w30 QS defy
1964 Ford Ranchero 302 c/4 15/40 Delo
1929 ford model A No filters, and 15/40 oil
Re: Stp and oil viscosity [Re: old1] #4758686
05/16/18 11:14 AM
05/16/18 11:14 AM
Joined: Jan 2006
Posts: 637
Mount Dora FL, Penfield NY, R...
ctrcbob Offline
ctrcbob  Offline
Joined: Jan 2006
Posts: 637
Mount Dora FL, Penfield NY, R...
I'm not as critical as others on the site. Years ago, when cars had Oil Pressure Gauges, my cars would sometimes show very low pressure. Especially at idle. One (blue) bottle of STP would fix that. If I would ever see my pressure lamp flicker, I'd have no problem adding any from the blue bottle. (The red bottle and the black bottle are different - I think one has more ZDDP and the other has more cleaning additives).

BTW; it mixes with your oil, no problems, and IT DOES NOT CLUMP.


Bob CTRC USN Ret.
Mount Dora FL,
Penfield NY
Roswell NM

2018 Sonata 2.0T Limited
2015 Sonata Sport 2.0T Limited
Re: Stp and oil viscosity [Re: MotoTribologist] #4758688
05/16/18 11:14 AM
05/16/18 11:14 AM
Joined: Jun 2016
Posts: 3,282
MN
oil_film_movies Offline
oil_film_movies  Offline
Joined: Jun 2016
Posts: 3,282
MN
Originally Posted By: MotoTribologist
It absolutely is miscible in oil. 15 oz. of that product to 4 quarts should still be an SAE 30 unless the starting viscosity of the 10W-30 was at the upper range of the spec. In that case it would be a low SAE 40.
You're right. http://www.widman.biz/English/Calculators/Mixtures.html and put in 200 cSt for STP at KV100. I used a KV100=11 cSt for the 10w30, middle of the 30 range. 15 oz is about 11% there. I got 12.9 cSt for the mixture, which is barely thick enough to be a 40 weight. Therefore, I predict you'd get a lighter version of a 10w40 out of your experiment, almost a thick 10w30.

Re: Stp and oil viscosity [Re: old1] #4758816
05/16/18 01:15 PM
05/16/18 01:15 PM
Joined: Dec 2015
Posts: 91
Pocatello, Idaho
compratio10_5 Offline
compratio10_5  Offline
Joined: Dec 2015
Posts: 91
Pocatello, Idaho
This post caught my attention because I tested this exact thing in the Mechanical Engineering Lab at the University of Idaho when I was a student there 50 years ago. The oil pressure gauge that I installed on my 57 Ford read only a few PSI at hot idle so I added 1 quart of STP. The hot idle oil pressure then went up to 20 PSI so I felt much better, but then started wondering how it would perform in cold weather. The Lab had a Saybolt Universal Viscosity tester that timed the oil flow through a capillary tube at 210F and at 100F. The used 10W-30 oil with STP taken from my car tested in the 20W-50 viscosity range. I have always wondered how the HTHS (high temperature, high shear) viscosity and the cold cranking temperature would have responded but those more important measures of viscosity were not tested in those days.


It's not what you don't know that hurts, it's what you think you know that ain't so. Will Rogers
Re: Stp and oil viscosity [Re: old1] #4758899
05/16/18 03:14 PM
05/16/18 03:14 PM
Joined: May 2013
Posts: 2,094
Saskatchewan, Canada
Johnny2Bad Offline
Johnny2Bad  Offline
Joined: May 2013
Posts: 2,094
Saskatchewan, Canada
STP is mostly an expensive bottle of Viscosity Improvers in a petroleum base; it increases oil viscosity. I'd hazard a guess at +20 SAE.


'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]
Re: Stp and oil viscosity [Re: old1] #4758932
05/16/18 03:55 PM
05/16/18 03:55 PM
Joined: Feb 2016
Posts: 686
NJ, USA
MotoTribologist Offline
MotoTribologist  Offline
Joined: Feb 2016
Posts: 686
NJ, USA
Or it would move it up to an SAE 40 or just a slightly higher SAE 30 as already shown in two previous posts.......

Re: Stp and oil viscosity [Re: old1] #4758995
05/16/18 05:19 PM
05/16/18 05:19 PM
Joined: Aug 2017
Posts: 552
Nebraska
BJD78 Offline
BJD78  Offline
Joined: Aug 2017
Posts: 552
Nebraska
A consumer reports 1996 According to a 1996 test conducted by Consumer Report , adding STP made a 10w30 more like a 15w40 oil. Granted that was 22 years ago so maybe STP is different now, but that is what STP formulation did back then.


2010 Forester:122K
2009 Sonata :189K
2010 Tucson:55K

OCI 5K using the cheapest dino oil I can buy,usually NAPA or TSC Travelers oil.
Re: Stp and oil viscosity [Re: old1] #4759023
05/16/18 05:48 PM
05/16/18 05:48 PM
Joined: Jan 2011
Posts: 1,045
Columbus Nebraska
old1 Offline OP
old1  Offline OP
Joined: Jan 2011
Posts: 1,045
Columbus Nebraska
Thanks all!!


2017 Nissan Frontier 4.0 5w30
1965 Mustang 200 c/4 10w30 QS defy
1964 Ford Ranchero 302 c/4 15/40 Delo
1929 ford model A No filters, and 15/40 oil
Re: Stp and oil viscosity [Re: old1] #4759290
05/16/18 10:04 PM
05/16/18 10:04 PM
Joined: Sep 2005
Posts: 14,354
Canada
addyguy Offline
addyguy  Offline
Joined: Sep 2005
Posts: 14,354
Canada
STP has stated that the 'goal' of their product is to raise the oil it is being added to by one viscosity grade.

Their example is it would turn a 10W-30 oil into a 15W-40 oil.

When I have seen UOA's where STP has been used, this is what I have seen - the oil is close to the next viscosity grade (some shearing occurs, so it is closer to the line between two grades.

I think in this day and age of severe fuel dilution in small, high-strung engines STP is just the thing to bring oil back to 'where its supposed to be'.


2010 Kia Soul 2U - 2.0L I-4, auto; 133k miles.
M1 EP 10W-30; OEM Kia filter.
Re: Stp and oil viscosity [Re: addyguy] #4759706
05/17/18 10:26 AM
05/17/18 10:26 AM
Joined: Jun 2016
Posts: 3,282
MN
oil_film_movies Offline
oil_film_movies  Offline
Joined: Jun 2016
Posts: 3,282
MN
Originally Posted By: addyguy
I think in this day and age of severe fuel dilution in small, high-strung engines STP is just the thing to bring oil back to 'where its supposed to be'.
One possible problem with that: STP used Group I or II base oils, prone to oxidation in high-strung engines, and the VII chemicals in there have been said to be low-quality types as well. This could lead to extra piston deposits and varnish. Using just a little in a well-formulated full synthetic oil shouldn't be a problem since it'll mix with the oil's powerful anti-oxidant package and dispersants. .... I think.

Instead, amazon order some Schaeffers Moly E.P. Oil Treatment, at KV100=238 cSt, its thick and likely has better components. It contains antimony and organic components, with very little other unnecessary stuff. Thickener for sure.

Re: Stp and oil viscosity [Re: old1] #4761410
05/18/18 08:47 PM
05/18/18 08:47 PM
Joined: Sep 2005
Posts: 14,354
Canada
addyguy Offline
addyguy  Offline
Joined: Sep 2005
Posts: 14,354
Canada
...or STP's new 'Synthetic' Oil Treatment in the gold bottle.

Has lots of goodies the 'regular' blue-bottle doesn't - detergents and antioxidants.


2010 Kia Soul 2U - 2.0L I-4, auto; 133k miles.
M1 EP 10W-30; OEM Kia filter.
Re: Stp and oil viscosity [Re: old1] #4763826
05/21/18 11:10 AM
05/21/18 11:10 AM
Joined: May 2010
Posts: 1,094
Ocala, Florida
racin4ds Offline
racin4ds  Offline
Joined: May 2010
Posts: 1,094
Ocala, Florida
My 08 Subie with the 2.5 turbo motor likes the grey bottle (high mileage formula with extra ZDDP) I just put a bottle in this weekend on top of my Maxlife 5W30 and within a few miles noticed the engine was much quieter! The high mileage (150k) and the turbo really beat the oil up, a little more Viscosity IMO is a good thing.


Just say NO to thin oils and M1!
05 F350 Powerstroke
05 Hyundai Tucson
08 Legacy GT
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