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Stp and oil viscosity #4758618 05/16/18 10:01 AM
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old1 Offline OP
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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 FOR SALE
1998 Mustang 3.8 automatic 78K miles
Re: Stp and oil viscosity [Re: old1] #4758636 05/16/18 10:19 AM
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Vladiator Offline
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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.


0W20 in summer at Death Valley is as good as 25w70 in winter at Alaska. Both can be done, neither is good for the engine long term. Oil grade is chosen by CLIMATE and OPERATING CONDITIONS.
Re: Stp and oil viscosity [Re: old1] #4758667 05/16/18 10:53 AM
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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
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old1 Offline OP
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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 FOR SALE
1998 Mustang 3.8 automatic 78K miles
Re: Stp and oil viscosity [Re: old1] #4758686 05/16/18 11:14 AM
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ctrcbob Offline
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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 Buick Regal Tour-X
2015 Sonata Sport 2.0T Limited
Re: Stp and oil viscosity [Re: MotoTribologist] #4758688 05/16/18 11:14 AM
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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
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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
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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
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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
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BJD78 Offline
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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

OCI 5K using TSC conventional Travelers oil.
Re: Stp and oil viscosity [Re: old1] #4759023 05/16/18 05:48 PM
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old1 Offline OP
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Thanks all!!


2017 Nissan Frontier 4.0 5w30
1965 Mustang 200 c/4 10w30 QS defy
1964 Ford Ranchero 302 c/4 FOR SALE
1998 Mustang 3.8 automatic 78K miles
Re: Stp and oil viscosity [Re: old1] #4759290 05/16/18 10:04 PM
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addyguy Offline
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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; 153k miles.
Castrol GTX 5W-20; Motomaster MPH 9688

2009 Pontiac G5 - 2.2 I-4, auto, 121k miles.
Oil/filter TBD
Re: Stp and oil viscosity [Re: addyguy] #4759706 05/17/18 10:26 AM
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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
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addyguy Offline
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...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; 153k miles.
Castrol GTX 5W-20; Motomaster MPH 9688

2009 Pontiac G5 - 2.2 I-4, auto, 121k miles.
Oil/filter TBD
Re: Stp and oil viscosity [Re: old1] #4763826 05/21/18 11:10 AM
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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
'13 Passat TDi SE+Nav
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