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Old 30th November 2014, 00:43   #1
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Default Spraying the underbody with used engine oil

I gave my car ( fiat Petra) for full servicing at servicing station at a fuel bunk
They do servicing of cars since a very long time

They had cleaned the car very well. The engine bay and underbody was spanking new. AC for some reason cooled rather well after servicing and car felt more responsive (air and fuel filters were changed or cleaned)


They had also sprayed the underbody with used engine oil.

Anybody knows how does this help? Does it help with underbody not catching rust?

I read somewhere else that rubber components of suspension get bloated as they absorb oil and later on crack. How true is this?

Basically does spraying of this used engine oil have any advantages or it's harmful for suspension components?
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Old 30th November 2014, 01:07   #2
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Default Re: Spraying the underbody with used engine oil

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Originally Posted by rikhav View Post
Anybody knows how does this help? Does it help with underbody not catching rust?
As per various internet sources, this is widely used to prevent rust. It seems to be a short term solution and are mostly used in commercial vehicles / off road vehicles or old generation cars.
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Old 30th November 2014, 16:01   #3
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Default Re: Spraying the underbody with used engine oil

The Ac worked better as the washed condenser rid of various debris and dirt would lead to better heat exchange.

Yes the rubber components will suffer on account of being sprayed with degraded oil.

There is no advantage to be accrued from this archaic practice which only tuns the underbody in to a dirt magnet.

In the past the untreated underbody components and the chassis itself were prone to rusting and this was a quick temporary fix.

Today's vehicles chassis and body shell even for the cheapest ones undergo phosphating, a process the seals the metal against rust and chemical fall out.


So effective is this treatment that it renders the need for any sort of underbody coating useless, including the ones offered by the modern car spas and dealerships what to talk about used oil spray.




Quote:
Originally Posted by rikhav View Post
I gave my car ( fiat Petra) for full servicing at servicing station at a fuel bunk
They do servicing of cars since a very long time

They had cleaned the car very well. The engine bay and underbody was spanking new. AC for some reason cooled rather well after servicing and car felt more responsive (air and fuel filters were changed or cleaned)


They had also sprayed the underbody with used engine oil.

Anybody knows how does this help? Does it help with underbody not catching rust?

I read somewhere else that rubber components of suspension get bloated as they absorb oil and later on crack. How true is this?

Basically does spraying of this used engine oil have any advantages or it's harmful for suspension components?
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Old 30th November 2014, 19:28   #4
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Default Re: Spraying the underbody with used engine oil

Quote:
Originally Posted by rikhav View Post

They had also sprayed the underbody with used engine oil.

Anybody knows how does this help? Does it help with underbody not catching rust?

I read somewhere else that rubber components of suspension get bloated as they absorb oil and later on crack. How true is this?

Basically does spraying of this used engine oil have any advantages or it's harmful for suspension components?
We used to spray engine oil mixed with diesel on the underbody of our Ambassador after water service, the main intention being to repel water and reduce the rust build up rate. So far we have not noticed any adverse effects on the rubber parts or the suspension components apart from the fact that they accumulate lots of dust. I also don't feel it is relevant in modern cars with treated panels.
regards adrian
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Old 30th November 2014, 21:01   #5
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Default Re: Spraying the underbody with used engine oil

Quote:
Originally Posted by khoj View Post
The Ac worked better as the washed condenser rid of various debris and dirt would lead to better heat exchange.

Yes the rubber components will suffer on account of being sprayed with degraded oil.

There is no advantage to be accrued from this archaic practice which only tuns the underbody in to a dirt magnet.

In the past the untreated underbody components and the chassis itself were prone to rusting and this was a quick temporary fix.

Today's vehicles chassis and body shell even for the cheapest ones undergo phosphating, a process the seals the metal against rust and chemical fall out.

Thanks a lot all of you

So effective is this treatment that it renders the need for any sort of underbody coating useless, including the ones offered by the modern car spas and dealerships what to talk about used oil spray.
AC works so well that I am surprised FIAT air conditioning system works so well. I used to service my car at a nearby Hyundai authorized service centra after anuroop auto shut shop
Never ever cleaning has made such a marked difference. That means these company service centres never bother to clean parts like condenser thoroughly. Even underbody is very clean


Quote:
Originally Posted by adrian View Post
We used to spray engine oil mixed with diesel on the underbody of our Ambassador after water service, the main intention being to repel water and reduce the rust build up rate. So far we have not noticed any adverse effects on the rubber parts or the suspension components apart from the fact that they accumulate lots of dust. I also don't feel it is relevant in modern cars with treated panels.
regards adrian
Quote:
Originally Posted by D C View Post
As per various internet sources, this is widely used to prevent rust. It seems to be a short term solution and are mostly used in commercial vehicles / off road vehicles or old generation cars.
So the spraying has no use per say. Very true that it will attract lot of dust and maybe in long run affect rubber parts

So I will continue with service and tell them strictly not to spray the underbody with oil

Anybody interested, I am discussing about the BP pump few buildings before Andheri shoppers stop
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Old 30th November 2014, 21:24   #6
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Default Re: Spraying the underbody with used engine oil

Quote:
Originally Posted by rikhav View Post
They had also sprayed the underbody with used engine oil.
Anybody knows how does this help?
I read somewhere else that rubber components of suspension get bloated as they absorb oil and later on crack. How true is this?
It's usually Engine oil + Diesel solution. People do believe spraying this solution after water wash should act as a water repellent and prevent from rusting. As explained by other members it will become a dirt magnet instead. Oil + Diesel will make the suspension (rubber) bushes characteristics deteriorate (by making them hard / brittle)

PS: there are possibilities that warranty claim of suspension bushes getting rejected when the trace of oil found on them.

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Originally Posted by rikhav View Post
I will continue with service and tell them strictly not to spray the underbody with oil
That's a safe bet.
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Old 30th November 2014, 23:09   #7
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Default Re: Spraying the underbody with used engine oil

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Originally Posted by Mr.Boss View Post
It's usually Engine oil + Diesel solution. People do believe spraying this solution after water wash should act as a water repellent and prevent from rusting. As explained by other members it will become a dirt magnet instead. Oil + Diesel will make the suspension (rubber) bushes characteristics deteriorate (by making them hard / brittle)

PS: there are possibilities that warranty claim of suspension bushes getting rejected when the trace of oil found on them.


That's a safe bet.
Mr. Boss
No worries about warranty as its ten year old car
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Old 1st December 2014, 08:54   #8
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Default Re: Spraying the underbody with used engine oil

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No worries about warranty as its ten year old car
I'm not particular about your car buddy. Shared this info for the benefit of fellow members whose car is still under warranty.
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Old 1st December 2014, 15:11   #9
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Default Re: Spraying the underbody with used engine oil

I thought used oil should be disposed with care, now it is being carelessly mixed with dust and next time washed down the drain polluting the environment.
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Old 1st December 2014, 16:44   #10
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Default Re: Spraying the underbody with used engine oil

Yes, its is illegal to dispose Burnt Engine oil this way. And most of the time this will be done by operators and they will also claim that the entire process is illegal.
This is from my experience in Calcutta a while back. Net off this might be OK for non phosphate coated under-bodies but is strictly not required for modern vehicles.
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Old 1st December 2014, 20:39   #11
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Default Re: Spraying the underbody with used engine oil

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Originally Posted by thoma View Post
I thought used oil should be disposed with care, now it is being carelessly mixed with dust and next time washed down the drain polluting the environment.
Quote:
Originally Posted by soumobakshi View Post
Yes, its is illegal to dispose Burnt Engine oil this way. And most of the time this will be done by operators and they will also claim that the entire process is illegal.
This is from my experience in Calcutta a while back. Net off this might be OK for non phosphate coated under-bodies but is strictly not required for modern vehicles.

They don't even ask customers if they want the car underbody sprayed with oil
They are bit of old school, typical of fuel stations like checking engine oil is at optimum temperature

I can't make them stop using used oil for other cars but I will make it a point they don't for my car. Apart from this cleaning and servicing is very good
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