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Diesel oil rather than petrol oil?

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Diesel oil rather than petrol oil?

Postby Ae92typeX » Thu Jul 28, 2005 9:53 am

People sometimes talk about putting diesel oil in their engines for afew km between changes to 'flush it out' as diesel oils have more cleaning properties.
Why would one not run a good diesel oil permantly in an engine?
A quick trip down to the local repco showed that some (not all) newer diesel oils on the market are rated API SL/CI. As far as im aware SL is the newest spark rating available for most oils, and is well above the reccomended for 99% of the engines we use on this forum. So in theory, is 100% safe and fine in a spark engine.
So yea, just interested in an informative discussion saying why/why not this oil would not be fine in a 'spark' car. :)
Cant believe im still a member here.

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Re: Diesel oil rather than petrol oil?

Postby Spannergal » Thu Jul 28, 2005 9:57 am

Ae92typeX wrote:People sometimes talk about putting diesel oil in their engines for afew km between changes to 'flush it out' as diesel oils have more cleaning properties.
Why would one not run a good diesel oil permantly in an engine?
A quick trip down to the local repco showed that some (not all) newer diesel oils on the market are rated API SL/CI. As far as im aware SL is the newest spark rating available for most oils, and is well above the reccomended for 99% of the engines we use on this forum. So in theory, is 100% safe and fine in a spark engine.
So yea, just interested in an informative discussion saying why/why not this oil would not be fine in a 'spark' car. :)


Not sure - but I suspect that possibly in saying diesel oil, it could be diesel fuel that they are refering to. In which case, it stuffs your fuel pump and filter.
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Postby evil_si » Thu Jul 28, 2005 10:34 am

yea the late model diesel engine oils are fine, look at the technology that valvoline, mobil and the likes of total oil put in to development of their products,

all of the big workshops ive worked in use diesel engine oil in their company vehicles, petrol ad diesel alike.
average diesel oil is from 15w, were as petrol is from 5 / 10w
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Postby Gadget » Thu Jul 28, 2005 11:12 am

You have heard correctly Ae92typeX, diesel oil has more detergents in it, therefore better cleaning properties...

AFAIK it doesn't hurt in the slightest running diesel oil day-to-day, as you pointed out, the 'spark engine' rating (API) is indeed present on most, if not all diesel oils.
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Postby adikt » Thu Jul 28, 2005 2:55 pm

im pretty sure you'll find that diesel oil doesnt have quite the same lubricating properties as petrol oil, due to the fact that diesel does a lot more lubricating of its own than petrol does.
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Postby TrouserFxGt » Thu Jul 28, 2005 3:41 pm

right?????
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Postby Gadget » Thu Jul 28, 2005 3:51 pm

adikt wrote:im pretty sure you'll find that diesel oil doesnt have quite the same lubricating properties as petrol oil, due to the fact that diesel does a lot more lubricating of its own than petrol does.

Right, cause the diesel gets down and helps lubricate the crank bearings and stuff real good aye? :lol:
Last edited by Gadget on Thu Jul 28, 2005 5:11 pm, edited 1 time in total.
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Postby Fraud » Thu Jul 28, 2005 4:26 pm

I would be concerned if the diesel was getting near any part of the oil system...
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Postby Punter » Thu Jul 28, 2005 5:09 pm

adikt wrote:im pretty sure you'll find that diesel oil doesnt have quite the same lubricating properties as petrol oil, due to the fact that diesel does a lot more lubricating of its own than petrol does.


Ahhh now i see. If i want to run my petrol engine on diesel oil, I'll have to fill the petrol tank with diesel as well.
:roll:
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Postby Gadget » Thu Jul 28, 2005 5:13 pm

Fraud wrote:I would be concerned if the diesel was getting near any part of the oil system...

In a perfect world Oil and Fuel should never meet.

Obviously rotaries and 2-strokes aren't perfect. :lol:
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Postby adikt » Thu Jul 28, 2005 5:57 pm

*shrug* i guess i interpreted my information wrong.
im still sure that diesel does do some lubricating of its own tho.
now i need to go find where i got the info from & re-read it
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Postby Phothog » Thu Jul 28, 2005 7:59 pm

adikt wrote:*shrug* i guess i interpreted my information wrong.
im still sure that diesel does do some lubricating of its own tho.
now i need to go find where i got the info from & re-read it


You are correct there... the sulpher (spelling) in the diesel fuel
lubicates the Diesel fuel pump...

Gadget wrote:
adikt wrote:
im pretty sure you'll find that diesel oil doesnt have quite the same lubricating properties as petrol oil, due to the fact that diesel does a lot more lubricating of its own than petrol does.


Right, cause the diesel gets down and helps lubricate the crank bearings and stuff real good aye?


We'll we quite offten drain 10+ litres of Diesel out of the Isuzu 4JX1 sumps
Nice injection system .... Not...
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Postby SaM » Sun Jul 31, 2005 10:09 pm

Gadget wrote:
Fraud wrote:I would be concerned if the diesel was getting near any part of the oil system...

In a perfect world Oil and Fuel should never meet.

Obviously rotaries and 2-strokes aren't perfect. :lol:


i have alot more fun wiv rotaries and 2 stroke motorbikes than you would ever dream of havn wiv a supra :lol:
Eagles may soar, but weasles dont get sucked into jet engines...
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