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STP and gear boxes

Tom in Mo.

Tom in Mo.

Well-known Member
I have several cans of STP on the shelf and was thinking about using it in a 100 hp gear box on the rotary cutter. I hate to throw it away. Any thoughts?
 
Use it as an additive not just straight. STP does not have all the properties of the correct lubricant but
is a good additive. We regularly use a similar Lucas product, Lucas Lube, with great results.
 
(quoted from post at 08:30:56 06/08/15) I have several cans of STP on the shelf and was thinking about using it in a 100 hp gear box on the rotary cutter. I hate to throw it away. Any thoughts?
Click to expand...

I don't see why it wouldn't work. I've got an old 12' Servis cutter that I use a good grease gun grease. It's been in there for over 10 years and I sometimes run it 8-10 hours at a time. I'm sure there will be some that would get their pantiloons in a wad if you don't use what the owners manual recommends.
 
I put some of it in my two rototiller gear boxes when I rebuilt them. I wouldn't use it straight but would think it would stick good on the gears.
 
(quoted from post at 05:30:56 06/08/15) I have several cans of STP on the shelf and was thinking about using it in a 100 hp gear box on the rotary cutter. I hate to throw it away. Any thoughts?
Click to expand...

Yeah. Soak the can in a pot of boiling water before you pour it in. It will flow much faster.
 
won't hurt a thing I got in our 10' cutter boxes, old super A got 4 bottles in the transmission 15 years ago as i couldn't find any straight 90w or 140w so I put the stp in the multi wt stopped the harsh gear clash problem, also has had 2 in the motor for years,old company truck with a 6.0 in it had 300,000 on it and getting 400 a week interstate and 250 job miles a week put on it when the man driving it said it was losing oil pressure, genius fleet manager at the shop told him to get the oil pump replaced in a worn out truck, in the mean time I drove to town,what oil pressure!!! I stopped at napa and poured 3 bottles of stp in it, same evening he called wanting to know what I done the oil pressure was back to normal I know it was 2 months before they finally replaced it after the transmission being giving problems, regardless of what gets told it is a good product these are only a few instances where I seen it used with good results no it's not a repair in a bottle
 
STP is 200 wt. So long as it is surrounding gears and not needing to go through passages, you'll be ok. I had a '69' Chevy K20 with a couple of broken teeth in one of the gears, and 90 wt didn't get it. I filled it with STP, and only had problems with it in cold winter time until it'd warm up. I'm not sure what to compare trying to shift when its about zero out and STP isn't exactly frozen because it doesn't freeze, but need a stout shifter and a bicep. STP in a gear box? A plain old gear box without a cooler? No complaints here.

Mark
 
Is the modern-day STP as thick as the old stuff of 30 years ago? I remember that it came in a metal can and my dad would heat the stuff up with a torch before pouring it into something. Now it just seems to be like gear lube. (I don't use it in anything, but I have seen the modern stuff in the plastic bottle and it's just not as thick)
 
before corn head grease my neighbor would buy it in 5 gallon cans from his crawler tractor dealer and use it in his final drives. he claimed he could get barbed wire wrapped around his drive axle and not have to immiediatly stop and change the axle seal.
 
I don't know about gear boxes But I know what not to use it for. Back in the early 60's I was driving a day cab Ford with a dump trailer, We greased and changed the oil every Sat. This was before I got smart and joined the Teamsters Union Any way I thought that STP would work real nice on the 5th. wheel. Take my word for it and don't try it. That crap squeezed out and ran down onto the drive shaft and it slung that snot like stuff all up over the back of the cab and some even got on the windshield. I had to clean that mess up and I can say I never tried that trick again. LOL
 
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