Underside oil spray?
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Elder User
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Underside oil spray?
Hello all,
I have been coating the underside of my trucks with several different oils for the past few years. I have used gear oil, used engine oil and tranny oil.
My question is has anyone else used these oils and had the same good results or used some other oil?
I usually crawl under the truck twice a year and give the complete underside a good coating with a brush to all exposed metal including the frame....although a bit messy and neck busting it seems to slow down the rusting process and also makes R&R parts much easier.
I have been coating the underside of my trucks with several different oils for the past few years. I have used gear oil, used engine oil and tranny oil.
My question is has anyone else used these oils and had the same good results or used some other oil?
I usually crawl under the truck twice a year and give the complete underside a good coating with a brush to all exposed metal including the frame....although a bit messy and neck busting it seems to slow down the rusting process and also makes R&R parts much easier.
More Turbo
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Underside oil spray?
Absolutely. We have many places that oil undercoat vehicles around here. Small 1/2" holes are drilled into the door panels and door beams, sprayed with oil and plugged w/removable plugs. Regular motor oil (used or new) is best. The gear oil is no good and the smell never goes away. The police departments, fire dept's and many municipal vehicles are done twice a year. True, the vehicles are a mess for a week or so but it does work great.
I had a vehile oiled and went on a trip. At a gas stop the attendant tried to tell me that my motor had blon up due to the oil under the hood. I showed him where it had been sprayed into the inner hood panel and he just could not fathom the practice.
Common here in VT.
Bob
I had a vehile oiled and went on a trip. At a gas stop the attendant tried to tell me that my motor had blon up due to the oil under the hood. I showed him where it had been sprayed into the inner hood panel and he just could not fathom the practice.
Common here in VT.
Bob
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Elder User
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Underside oil spray?
Hey Bob, thanks for the reply.
I know the stink from the gear oil is bad but have you actually heard why it is bad to use? I would think that it would be a bit better due to the fact that it is much thicker and not as likely to run off and more likely to stick and may even last longer?
Let me know,
I know the stink from the gear oil is bad but have you actually heard why it is bad to use? I would think that it would be a bit better due to the fact that it is much thicker and not as likely to run off and more likely to stick and may even last longer?
Let me know,
Elder User
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From: Ontario, canada
Underside oil spray?
I have had good luck using atf mixed with grease, heated up and sprayed on hot. It dosent smell like gear oil does, and it seems to "seep" into crevaces. I use a cheapo internal mix spray gun to put it on with and it does make a great big mess!
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Underside oil spray?
Yes, the spray gun idea is great as long as you have a compressor. I have been so desperate as to use old windex bottles but unfortunately I cannot get the thickness down so it sprays in one big stream so now I say the hell with it and let her fly with a large paint brush. That's Dirty!
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Underside oil spray?
[updated:LAST EDITED ON 26-Jun-02 AT 01:42 PM (EST)]I go to Walmart and buy 4 litres (1gal) of the cheapest 10w30 they have and use this to spray my vehicles. I use a applicator that is made for the job, it has attachments that fit into the drain holes on the bodies and doors, no drilling required. It looks like a paint spray gun, holds a quart. I tried using hydralic(sp) oil once because I was told that's what the Rust Check stuff is, but it was too thin and seemed to "evaporate" quickly. Never use used engine oil, the acids in it from the crankcase gases will cause any rubber parts to break down. Also in my neck of the woods, (Ontario, Canada)it is illegal to use used engine oil, they call it "improper dumping of hazardous waste"!
More Turbo
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Underside oil spray?
Well...urrrr yeah 
the law is the same in Vermont too. Mechanics are "supposed" to use new oil.
Bob
the law is the same in Vermont too. Mechanics are "supposed" to use new oil.Bob
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Underside oil spray?
This is the first time I've heard of someone deliberately coating the underside of a truck with used motor oil.If I'd have known this was a good thing, I would'nt have replaced the rear main seal. I was having it done automatically while I drove. Maybe I,ll loosen my oil pan to make sure it's coated reeeaaal good. HAW HAW HAW
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Elder User
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Underside oil spray?
Well, crazy as it sounds have you ever looked underneath a vehicle that had a long oil leak such as a rear main or even better a pinion seal leakage? When it shoots oil all up on the floor you never see rust anywhere near the area.
Although enviromentally speaking it is not a good method it sure will put a halt to rust forming especially if you can get to the metal before rust has even formed. Unfortunately for the last 10 years all the vehicles that I have owned all ready were attacked by rust but when I get that nice new truck some day it will see a nice coating of oil on the belly the first week.
Although enviromentally speaking it is not a good method it sure will put a halt to rust forming especially if you can get to the metal before rust has even formed. Unfortunately for the last 10 years all the vehicles that I have owned all ready were attacked by rust but when I get that nice new truck some day it will see a nice coating of oil on the belly the first week.
Post Fiend
Joined: Jan 2000
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From: Metro Detroit (Redford)
Underside oil spray?
Nice idea but it must collect a lot of dirt. Do you have to power wash the dirt off to re-oil it?
I think a good undercoating job would be better. My wife's '92 aerostar was already undercoated when we got it in '95 and today it has no underbody rust. Problem is that many undercoating companies and/or processes are not that good.
What about coating the underbody with that asphalt roof sealer stuff?
I think a good undercoating job would be better. My wife's '92 aerostar was already undercoated when we got it in '95 and today it has no underbody rust. Problem is that many undercoating companies and/or processes are not that good.
What about coating the underbody with that asphalt roof sealer stuff?
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Underside oil spray?
Hi TallPaul,
No I have never had to wash any dirt off but it is a good point and I cannot answer why really. I guess the rain looks after it. If you could get the sealer on the metal before any rust is visible I suppose it would work ok. But in my experience with other people the undercoating spray either hardens up and cracks or it is applied on top of flaking rust and just comes off eventually.
Still love my oil painting.
No I have never had to wash any dirt off but it is a good point and I cannot answer why really. I guess the rain looks after it. If you could get the sealer on the metal before any rust is visible I suppose it would work ok. But in my experience with other people the undercoating spray either hardens up and cracks or it is applied on top of flaking rust and just comes off eventually.
Still love my oil painting.