Today's STP

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Just wondering what is in today's STP oil treatment? Is it the same formula from years past? I recall my father putting in a blue can of STP years ago in his Ford 429 cid powered station wagon before towing his 6,000 pound camper back in the early 1970's.
 
I think it's just viscosity improvers and a tiny bit of ZDDP.

It used to have a lot of zinc, and made a fair assembly lube. Not any more.
 
My Dad loved the stuff. Dumped in it everything. Bought it by the gallon. Never caused problems but I never thought it was a good idea dumping a thick goo in the motor.
Thought it would end up in the bottom of the pan.
 
There must be miles on this topic in the archives ..............in here,,,but then again, I like MMO>>
 
Originally Posted By: CourierDriver
,,but then again, I like MMO>>

I put MMO in the gas, but not the oil.
 
Originally Posted By: Camprunner
Just wondering what is in today's STP oil treatment? Is it the same formula from years past? I recall my father putting in a blue can of STP years ago in his Ford 429 cid powered station wagon before towing his 6,000 pound camper back in the early 1970's.


Which one?

I see three versions at WallyWorld, O'Reilley's, and Advance.

Send in a sample to Blackstone and see what elements it has in it.

It used to be mostly a very poor version of an OCP VII and thickeners.
 
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Originally Posted By: Linctex
Originally Posted By: CourierDriver
,,but then again, I like MMO>>

I put MMO in the gas, but not the oil.


I use it in the gas too for my ope.
It works well for that application.
 
Originally Posted By: AirgunSavant
Originally Posted By: Linctex
Originally Posted By: CourierDriver
,,but then again, I like MMO>>

I put MMO in the gas, but not the oil.


I use it in the gas too for my ope.
It works well for that application.


What is your criteria for knowing it works well for OPE?
 
Originally Posted By: Donald
Originally Posted By: AirgunSavant

I use it in the gas too for my ope.
It works well for that application.


What is your criteria for knowing it works well for OPE?


Perhaps as a fuel stabilizer?
 
Originally Posted By: Linctex
I think it's just viscosity improvers and a tiny bit of ZDDP.

It used to have a lot of zinc, and made a fair assembly lube. Not any more.


It might be 'just the opposite'

I bought some a few months ago to see if it would reduce my oil consumption.

I built one engine about 30 years ago and seemed to think it was a grey gooey additive when i used it 50/50 with oil as an assembly lube.

When I opened the blue bottle it was honey color and poured much faster; I'm thinking it is a ZDDP additive now.
 
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