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#998026 - Thu Jan 09 2014 05:42 AM STP  
49Chief  Offline
Shop Shark
Joined: Dec 2008
Posts: 91
Kansas City
Has anyone have any thoughts about using STP Oil Treatment as a supplement for ZDDP in their oil ? The bottle says it has ZDDP in it but I don't know how much.


Life is to short to be stuck in a rut.

"One thing about trains, it doesn't matter where there going, what matters is, deciding to get on." - Polar Express

God is great, Beer is good, and people are crazy.


#998027 - Thu Jan 09 2014 05:47 AM Re: STP [Re: 49Chief]  
Hotrod Lincoln  Offline
Extreme Gabster
Joined: Feb 2004
Posts: 14,656
Dellrose, TN
Way back in the dark ages, I used STP as an assembly lube on engine overhauls. Every engine I built that way had some sort of oil-related failure and didn't go the expected distance. Just to prove to myself that it was just a coincidence, I built one more engine with STP. That one stuck the oil pump relief valve open and trashed a crankshaft. Now I wouldn't put STP in a lawn mower with a rod knock!
Jerry

Last edited by Hotrod Lincoln; Thu Jan 09 2014 05:49 AM.

Who says I live in a rough neighborhood- - - - -?
Just because I'm a tail gunner on a beer truck, maybe?

"He ain't even got a noddin' acquaintance with the truth- - -let alone a speakin' one!"


#998030 - Thu Jan 09 2014 06:08 AM Re: STP [Re: 49Chief]  
49Chief  Offline
Shop Shark
Joined: Dec 2008
Posts: 91
Kansas City
Bought a 87 F150 5.0 that had 105k miles from a guy that had it since new. I kept the same oil change regimen he did. (Mobil Del-vac 15w40 and a bottle of STP) Don't ask me why I just done it. With a name brand filter, Motorcraft mostly. When rust finally ate up the truck to where you could not drive it anymore the engine had 367k miles and still going strong. Just sayin.


Life is to short to be stuck in a rut.

"One thing about trains, it doesn't matter where there going, what matters is, deciding to get on." - Polar Express

God is great, Beer is good, and people are crazy.

#998033 - Thu Jan 09 2014 06:23 AM Re: STP [Re: 49Chief]  
J M  Offline
Shop Shark
Joined: Nov 2006
Posts: 292
Gunnison Colorado
I worked for awhile in a small independent shop. We had a costumer that wanted a can of STP put in his car with each oil change. We had to pull the pan for some reason and there was about two inches of gunk in the bottom of the pan. I don't put it in anything I own.
Jim

Last edited by J M; Thu Jan 09 2014 06:32 AM.

#998036 - Thu Jan 09 2014 06:39 AM Re: STP [Re: 49Chief]  
Jim Sears  Offline
Shop Shark
Joined: Jan 2013
Posts: 1,408
MA
I have used STP for assembly lube for decades. Best thing in the world if you aren't doing a rebuild and reinstall to run in 48 hrs. Everything else will run off in no time, you can take the engine apart weeks later (without running it) and there is still a coating of STP on everything.

With newer engines running tight tolerances and new oil technology, I've stopped running additives at all.

When I had a fleet of rental VW Vanagon campers (water cooled)in the early 2000's, I always used used STP to rebuild, but with the first oil change I would add a teflon additive like Tplus or T-fal I think were the names.
That got a lot of customer abused buses home, badly overheated, low on oil, pushed to the limits, that normally should have stopped running.
The engines I bought for rebuilding had been through the same thing but they had spun bearings, seized pistons etc.
Just my experience.


#998042 - Thu Jan 09 2014 07:01 AM Re: STP [Re: 49Chief]  
crenwelge  Offline
Shop Shark
Joined: Jan 2008
Posts: 4,657
Fredericksburg, Texas
We used to sell a lot of STP to people with old worn out engines. It quietened them down, cut down on oil consumption and raised the oil pressure. We even used it in our old GMC gassers and 855 Block Cummins engines to make a few more trips until we overhauled them. It needs to be added slowly with the motor hot and running. Otherwise a blob of it will settle in front of the oil pickup and starve the engine for oil. I think it has kind of outlived its usefulness, but it kept a lot of old engines going a little while longer back in its heyday. I still use ZDDP on flat tappet engines. My father sold an oil that had zinc in it. It was something that was developed during the war and was way ahead of its time.


#998044 - Thu Jan 09 2014 07:17 AM Re: STP [Re: 49Chief]  
Truckrolet  Offline
Shop Shark
Joined: Feb 2011
Posts: 1,036
Wa
Like posted above, I've seen STP save a few old worn out aircooled engines (VW). As a youngster I remember one of the mechanics at the FBO I worked at using STP for a continental aircraft engine overhaul. Approved or not for aircraft it was his choice, he said he's the one signing off the paper work.


No more trucks

#998074 - Thu Jan 09 2014 04:02 PM Re: STP [Re: 49Chief]  
Justhorsenround  Offline
Shop Shark
Joined: Apr 2005
Posts: 3,169
Central, Oklahoma
Used STP mixed with 2 qts of 30wt oil in every old mower engine I brought back to life from the scrap pile. Every one started on the first pull and I never had to add any oil to them again. Sold hundreds of those old mowers for $25 over the course of 4-5 years.


Martin

'48 Chevy Suburban Street Rod
'47 Chevy 3100 5 Window (long term project)

"I fought the law and the law won" now I are a retired one!

48 Burb

#998106 - Thu Jan 09 2014 06:16 PM Re: STP [Re: 49Chief]  
Whitelightning  Offline
Shop Shark
Joined: Dec 2001
Posts: 1,326
I had always heard STP wasn't good to use in air cooled engines... Go figure....

John


#998217 - Fri Jan 10 2014 02:27 AM Re: STP [Re: 49Chief]  
cheezwhiz  Offline
New Guy
Joined: Jan 2014
Posts: 6
Pacific NW
I don't have any doubt that STP used to have its place, but I wouldn't be surprised if it has been reformulated to the point where it doesn't do our old engines much good. My short answer would be to use a flat tappet additive and my long answer would be to go to the Bob is the Oil Guy forums (BITOG). They will have you enrolled in undergraduate chemistry courses before long :)


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