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#1483035 - 05/31/09 10:24 PM Pros and Cons of Diesel Oil in Gasoline Engine?
lancerplayer Offline


Registered: 09/09/07
Posts: 257
Loc: Cleveland, OH
What are the pros and cons of using diesel oil in a gasoline engine? I know diesel oils has more additives and detergents and such, but is that the only reason?
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#1483045 - 05/31/09 10:32 PM Re: Pros and Cons of Diesel Oil in Gasoline Engine? [Re: lancerplayer]
pitzel Offline


Registered: 09/13/04
Posts: 1469
Loc: Saskatchewan, Canada
Pros: more ZDDP.
Higher initial TBN
Lower cost due to less marketing.

Cons: higher ZDDP (not good if you are a frequent oil changer and have emmissions gear, but probably not an issue if you do extended drains).
Typically only available in heavier viscosities.
May not be readily available.
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#1483202 - 06/01/09 05:13 AM Re: Pros and Cons of Diesel Oil in Gasoline Engine? [Re: pitzel]
Char Baby Offline


Registered: 05/25/05
Posts: 8785
Loc: Western NY
May reduce MPG but, not always!
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Still looking for a car for my wife(new, used, CPO)

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#1483465 - 06/01/09 11:07 AM Re: Pros and Cons of Diesel Oil in Gasoline Engine? [Re: Char Baby]
addyguy Offline


Registered: 09/08/05
Posts: 14027
Loc: Canada
Pro: Thicker, most are 40-weight, even the 30 weights are heavy within the grade - may help consumption.
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#1483530 - 06/01/09 12:07 PM Re: Pros and Cons of Diesel Oil in Gasoline Engine? [Re: addyguy]
pickled Offline


Registered: 02/14/08
Posts: 2098
Loc: The Rocky Mountains
Pros contamination tolerance Cons well sometimes you can only by them by the gallon.
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#1483778 - 06/01/09 05:39 PM Re: Pros and Cons of Diesel Oil in Gasoline Engine? [Re: pickled]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
There is a 10-30 available, but that is the thinnest I've heard of.
Normally 15-40 or 5-40.
This is a bit thick for modern cars. Not a big deal in Summer, but cold starts in winter will suffer -flow and drag.

I think if they had a5-20 and 5-30 HD oil, everyone here would consider using it, otherwise.

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#1483805 - 06/01/09 06:11 PM Re: Pros and Cons of Diesel Oil in Gasoline Engine? [Re: mechtech2]
wannafbody Offline


Registered: 01/02/08
Posts: 895
Loc: PA
Cons: spark plugs start to glow
engine sounds like rattling cans
blows black smoke







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#1483837 - 06/01/09 06:42 PM Re: Pros and Cons of Diesel Oil in Gasoline Engine? [Re: wannafbody]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 10597
Loc: N.H, U.S.A.
How about the magnesium additive; that is usually not in PCMO, mosy likely for a good reason. Will that Mg (?) compound cause some issues?
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#1483841 - 06/01/09 06:50 PM Re: Pros and Cons of Diesel Oil in Gasoline Engine [Re: ARCOgraphite]
Ben99GT Offline


Registered: 02/25/05
Posts: 4311
Loc: MS
According to Horsepower TV, Rotella will cause engine sludge in a gasoline engine.

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#1483845 - 06/01/09 06:55 PM Re: Pros and Cons of Diesel Oil in Gasoline Engine [Re: ARCOgraphite]
saaber1 Offline


Registered: 11/28/07
Posts: 1877
Loc: Pacnw
 Originally Posted By: ARCOgraphite
How about the magnesium additive; that is usually not in PCMO, mosy likely for a good reason. Will that Mg (?) compound cause some issues?


Castrol syntec 5W40 is loaded with Magnesium. As I remember I saw on the order of 700-900ppm on UOAs.
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"when 5W30 is cold, ...the oil is 35 weight (5+30),...20 w 50 starts at 70 and warms up to 50"
- Kyle, auto mechanic & VP Speedline Motorsports, INTL

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#1483848 - 06/01/09 06:57 PM Re: Pros and Cons of Diesel Oil in Gasoline Engine [Re: Ben99GT]
saaber1 Offline


Registered: 11/28/07
Posts: 1877
Loc: Pacnw
 Originally Posted By: Ben99GT
According to Horsepower TV, Rotella will cause engine sludge in a gasoline engine.


What is horsepower tv? I assume an informercial? What brand are they trying to sell if it is an infomercial?
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"when 5W30 is cold, ...the oil is 35 weight (5+30),...20 w 50 starts at 70 and warms up to 50"
- Kyle, auto mechanic & VP Speedline Motorsports, INTL

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#1483868 - 06/01/09 07:18 PM Re: Pros and Cons of Diesel Oil in Gasoline Engine [Re: saaber1]
Doug Hillary Offline


Registered: 05/30/03
Posts: 5102
Loc: Airlie Beach Australia
Hi,
saaber1 - "Magnesium" is typically used as a detergent. It is being replaced in some HDEOs by the more expensive "Calcium" products

HDEOs that are not endorsed "mixed fleet" and carry dual petrol/diesel API/ACEA Quality ratings should NOT be used in petrol engines. This especially applies to those with a very high TBN due to their likely SA levels
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Doug

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#1483900 - 06/01/09 07:59 PM Re: Pros and Cons of Diesel Oil in Gasoline Engine [Re: Doug Hillary]
FiremarshalRob Offline


Registered: 03/25/08
Posts: 553
Loc: Baton Rouge, LA
What about SAE 30 in an older model vehicle that calls for 5w-30?
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#1483935 - 06/01/09 08:23 PM Re: Pros and Cons of Diesel Oil in Gasoline Engine [Re: Doug Hillary]
IcebergS2000 Offline


Registered: 10/19/07
Posts: 74
Loc: Southeast Texas
 Originally Posted By: Doug Hillary

HDEOs that are not endorsed "mixed fleet" and carry dual petrol/diesel API/ACEA Quality ratings should NOT be used in petrol engines. This especially applies to those with a very high TBN due to their likely SA levels


Just want to clarify your statement... Are you saying that, if they do not say "mixed fleet", even though they may be SM rated, they should still not be used in a gasoline engine?
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#1483950 - 06/01/09 08:34 PM Re: Pros and Cons of Diesel Oil in Gasoline Engine [Re: Ben99GT]
StevieC Offline


Registered: 08/21/08
Posts: 14339
Loc: Niagara Falls, ON, CA (near)
 Originally Posted By: Ben99GT
According to Horsepower TV, Rotella will cause engine sludge in a gasoline engine.

I heard that last weekend... I laughed too!
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