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#3264767 - 01/30/14 11:06 AM Diesel oil to clean petrol engine?
Spetz Offline


Registered: 01/23/14
Posts: 205
Loc: Australia
I've heard of people saying to run diesel oil in a petrol engine to clean it out due to the extra cleaning properties in the diesel oil.

Is there truth to this?
Any disadvantages, or things to be careful of?
Recommended oils etc?
_________________________
2003 Mitsubishi Diamante 6G74 3.5L. 5 Speed auto. 130,000 miles

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#3264779 - 01/30/14 11:25 AM Re: Diesel oil to clean petrol engine? [Re: Spetz]
NHGUY Offline


Registered: 10/09/11
Posts: 4108
Loc: USA
Engine flushes are largely kerosene.

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#3264785 - 01/30/14 11:30 AM Re: Diesel oil to clean petrol engine? [Re: Spetz]
Eddie Offline


Registered: 12/07/03
Posts: 7431
Loc: Florida, Cape Coral
Not good for the cat converter because of increased zinc
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#3264786 - 01/30/14 11:32 AM Re: Diesel oil to clean petrol engine? [Re: Spetz]
RobertISaar Offline


Registered: 08/21/12
Posts: 142
Loc: Camden, MI, USA
i've used kerosene to good effect before.

kerosene and diesel are so similar that i really wouldn't have a problem with either.

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#3264787 - 01/30/14 11:33 AM Re: Diesel oil to clean petrol engine? [Re: Spetz]
expat Online   content


Registered: 05/12/09
Posts: 4511
Loc: Canada
Do you mean Diesel Fuel or Diesel Motor Oil?

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#3264792 - 01/30/14 11:39 AM Re: Diesel oil to clean petrol engine? [Re: Spetz]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 9345
Loc: N.H, U.S.A.
Just a Quality LL synthetic will do the job. Better than 15w40 Fleet oil. STay away from Mg compound dps. Nasty residue.
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2014 Nissan Rogue S CVT, OC#2 6627mi-Synpower 5W30+PCX-004 S2000 Filter
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#3264805 - 01/30/14 11:48 AM Re: Diesel oil to clean petrol engine? [Re: Spetz]
Spetz Offline


Registered: 01/23/14
Posts: 205
Loc: Australia
Actually I meant using oil designed to be used in diesel motors, not actual diesel fuel
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#3264817 - 01/30/14 11:56 AM Re: Diesel oil to clean petrol engine? [Re: Spetz]
expat Online   content


Registered: 05/12/09
Posts: 4511
Loc: Canada
Most HDEO's are rated for Gas or Diesel
If you don't mind 10w-30 or 15w-40 there are some very good HDEO's available.

I have used Rotella in my Triumph for years, My Toyota 22R also gets it in the summer.

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#3264846 - 01/30/14 12:39 PM Re: Diesel oil to clean petrol engine? [Re: Spetz]
dparm Offline


Registered: 04/19/10
Posts: 12612
Loc: Chicago, IL
Many diesel oils carry API SL/SM certifications, meaning they are safe for use in gasoline motors. I'm not sure they would clean any better than gasoline oils though.
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#3264875 - 01/30/14 01:02 PM Re: Diesel oil to clean petrol engine? [Re: Spetz]
turtlevette Offline


Registered: 12/24/13
Posts: 1912
Loc: Massachusetts
Originally Posted By: Spetz
Actually I meant using oil designed to be used in diesel motors, not actual diesel fuel


Yes, Diesel oils have more detergents and dispersants than gas engine oils. I'm using some M1 TDT I got cheap at AZ to clean up my old Trans Am engine. Run it until it gets dark, dump it, new filter then repeat.
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#3266551 - 02/01/14 07:28 AM Re: Diesel oil to clean petrol engine? [Re: Spetz]
fdcg27 Online   content


Registered: 09/25/09
Posts: 10991
Loc: OH
Originally Posted By: Spetz
I've heard of people saying to run diesel oil in a petrol engine to clean it out due to the extra cleaning properties in the diesel oil.

Is there truth to this?
Any disadvantages, or things to be careful of?
Recommended oils etc?


There may be some merit to this idea.
HDEOs often have an add pack rich in magnesium which may be a more efficient detergent/dispersant than the caclcium which is usually the dominant detergency add in PCMOs.
Magnesium also incidentally gives better TBN retention than calcium.
If I were going to try this approach, I'd look at formulation and select an oil with plenty of magnesium and calcium to maximize the cleaning potential.
Still, unless an engine has been badly negelected or has suffered something like coolant leaking into the oil, there isn't usually much to clean up.
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#3266702 - 02/01/14 10:21 AM Re: Diesel oil to clean petrol engine? [Re: Spetz]
jamesyarbrough Offline


Registered: 01/17/14
Posts: 295
Loc: Denison TX
http://www.pqiamerica.com/May%202013/consolidatedhdeo.html

http://www.pqiamerica.com/March2013PCMO/Marchsyntheticsallfinal.html




But doesn't the new M1 5w30 have a lot of magnesium? And so does the Castrol line of synthetics if I recall...
if this is true the need for HDEO is negated, especially since some of the popular versions like rotella only have calcium now



Edited by jamesyarbrough (02/01/14 10:27 AM)
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#3267510 - 02/02/14 02:34 AM Re: Diesel oil to clean petrol engine? [Re: Eddie]
Shannow Offline


Registered: 12/12/02
Posts: 29780
Loc: Oz
Originally Posted By: Eddie
Not good for the cat converter because of increased zinc


If they meet "S" specs, then this isn't true...40s are allowed to have higher zinc, as less reaches the cat convertor through reduced consumption.

If 1qt of 20 or 30 per 1,000 miles passing through the cat is OK (as per OEMs), then any normal car with normal oil consumption, HDMO additive levels are no issue at all.

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#3272109 - 02/06/14 05:56 AM Re: Diesel oil to clean petrol engine? [Re: Spetz]
ac_tc Offline


Registered: 05/06/08
Posts: 589
Loc: sweden
It works fine as cleaning oil...
It works fine as lubricating oil also...
And while it may not be the best for a catcon it wont killém either.
They have a tendency to turn black quickly if the engine isnt squeeky clean so dont change to soon.
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-98 Dodge Durango 5.9 4*4 HDEO 10w- 40 ci4
-04 PT Cruser GT 10w- 40 HDEO ci4
-Everything else HDEO 10w- 40 ci4/STOU 10w-30/THF

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#3272281 - 02/06/14 09:14 AM Re: Diesel oil to clean petrol engine? [Re: Spetz]
UG_Passat Offline


Registered: 05/27/08
Posts: 1192
Loc: NJ
I use HDEO anyway in my petrol engine.

have you considered AutoRX? It used to be the rage on this forums

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