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#1421983 - 04/01/09 02:12 PM diesel motor oil in a gas engine
tonycarguy Offline


Registered: 10/22/08
Posts: 1048
Loc: Sunny Calif
What are the pros and cons of using a motor oil advertised as "for diesels" in a gas engine? Let's assume it's SL/SM rated, and the viscosity is appropriate for the engine & climate

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#1421985 - 04/01/09 02:14 PM Re: diesel motor oil in a gas engine [Re: tonycarguy]
Falcon_LS Offline


Registered: 10/03/08
Posts: 3477
Loc: Kuwait
I'm currently using Pennzoil Long Life Gold 15W-40 in my Montero. Biggest advantage so far has been reduced oil consumption and a much quieter engine.
_________________________
00 Pajero: M1 0W-40/26300-35503
01 Marquis: M1 ESP Formula 5W-30/FL820S
05 Envoy: M1 ESP Formula 5W-30/51522XP

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#1422030 - 04/01/09 03:17 PM Re: diesel motor oil in a gas engine [Re: Falcon_LS]
bepperb Offline


Registered: 01/10/08
Posts: 4652
Loc: Milwaukee, WI
More zddp causing possible o2/cat poisoning but perhaps better protection for non-roller valvetrains?
_________________________
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#1422053 - 04/01/09 03:40 PM Re: diesel motor oil in a gas engine [Re: bepperb]
jstutz Offline


Registered: 10/06/08
Posts: 1485
Loc: NC
I have been using it in my chevys for a while and notice a quieter engine, slightly reduced gas mileage. I track my mileage every time i get gas so over years you can get a pretty good avg. Overall i like it but it dont get all that cold here in nc. in the winter, i prefer something a little thinner just because the HDEO is a pretty thick. The new CJ oils are great for gassers becuase the zddp levels dropped to about 1200. I think alot of it depends on the way the vehicle is used. if it is cold and you jump in and tear off then i would definateally use the thinner oils. I am always cautious and driver very easy for the first 15 mins when it is cold out. You are probably going to get alot of opinions about this. The facts are this, many people have had good use of HDEO in gas vehicles for a long time (300k miles or more). Which is better, who knows. I believe this depends on how the vehicle is used and under what conditions. I know a few people in PA and NJ that use HDEO 15w40 all the time and dont seem to have issues. Personally i believe in cold temps under say 30F i believe the benefits of thinner oil will trump the advantages of HDEO. Especially in newer engines and OHC engines. Just my thoughts.

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#1422068 - 04/01/09 03:59 PM Re: diesel motor oil in a gas engine [Re: bepperb]
tonycarguy Offline


Registered: 10/22/08
Posts: 1048
Loc: Sunny Calif
 Originally Posted By: bepperb
More zddp causing possible o2/cat poisoning but perhaps better protection for non-roller valvetrains?


I was thinking about this too, but if it had unsafe levels of additives, how could it meet the SL/SM spec for street use?

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#1422682 - 04/02/09 09:09 AM Re: diesel motor oil in a gas engine [Re: tonycarguy]
jstutz Offline


Registered: 10/06/08
Posts: 1485
Loc: NC
If it is a diesel rated oil first, SM says they can have up to 1200 ppm ZDDP. PCMO is speced at 800ppm.

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#1426077 - 04/05/09 10:23 PM Re: diesel motor oil in a gas engine [Re: jstutz]
SubLGT Offline


Registered: 01/31/06
Posts: 1781
Loc: Idaho
Neither API SM or API SL alone specify a maximum phosphorous content. These certifications only specify a minimum P content. Max P content is specified by ILSAC GF-4 (.08%) and API CJ-4 (0.12%).

See:
http://www.infineum.com/information/tables.html

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#1432364 - 04/12/09 02:20 AM Re: diesel motor oil in a gas engine [Re: SubLGT]
Ramblin Fever Offline


Registered: 06/28/05
Posts: 1627
Loc: Timberline
I am and have been using diesel/gasoline oil, specifically Rotella 5w-40 in my gas engines for quite some time; have not noticed any harmful effects. Gas mileage in both trucks have stayed the same, no change.

An Isuzu engine specialist highly recommends the diesel rated oils even in Isuzu gas engines; says the Rotella is the best oil available for the gas Isuzu engines as well as the diesels.

Spoken to several ole time engine rebuilders here in Colorado that also swear by diesel rated oils in gas engines, as long as it's not a new ford, dodge, etc that specifically call for the water-thin type oils.

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#1435981 - 04/15/09 09:36 PM Re: diesel motor oil in a gas engine [Re: Ramblin Fever]
aquariuscsm Offline


Registered: 12/30/06
Posts: 9552
Loc: South Texas,USA
I use Royal Purple 15W40 for my winter fills. Excellent oil!!!!!
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Syntec 10W40/Fram Ultra
Amsoil MTG(tranny)
Amsoil 80W90 GL5(rear diff)
Mobil 1 ATF
Redline Water Wetter

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#1439032 - 04/19/09 08:59 AM Re: diesel motor oil in a gas engine [Re: aquariuscsm]
maintenanceMan Offline


Registered: 04/18/09
Posts: 24
Loc: Alabama
I have a 99 Isuzu trooper I typically use a Diesel or heavyweight auto oil in. It reduces oil consumption at least until the viscosity thins at about 3000 miles.

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#1443816 - 04/24/09 07:38 AM Re: diesel motor oil in a gas engine [Re: tonycarguy]
fraso Offline


Registered: 03/03/09
Posts: 153
Loc: Fort Erie, ON
 Originally Posted By: tonycarguy
What are the pros and cons of using a motor oil advertised as "for diesels" in a gas engine? Let's assume it's SL/SM rated, and the viscosity is appropriate for the engine & climate.


I have also been trying to get a definitive answer on this. For example, Mobil 1 Turbo Diesel Truck 5W-40's product page reads:

 Originally Posted By: "Mobil 1 Turbo Diesel Truck 5W-40"

Applications

Mobil 1 Turbo Diesel Truck 5W-40 is recommended for use in all super high performance diesel applications, including modern low emission engine designs with Exhaust Gas Recirculation (EGR). These applications include the following:


  • On-highway engines operating in both high speed/high load and stop-and-go conditions
  • Off-highway engines operating in severe low speed/heavy load conditions
  • Virtually all diesel powered equipment from American, European, and Japanese equipment builders
  • High performance gasoline engines and mixed fleets
  • Refrigeration units

Specifications and Approvals
API CJ-4, CI-4 PLUS/CI-4/CH-4/CG-4/ SM/SL/SJ


Besides a pair of Saturn SL2s (1998 & 2001), I also have a 2002 Camaro SS (5.7L), a 2002 Toyota Sienna (3.0L), a 2003 Impala LS (3.8L), and a 1965 Barracuda (225). All of the newer cars require 5W-30 oils. Toyota specifies SL/SJ while GM only specifies Starburst. I would like to use a 0W-30 CJ-4/SM/SL/SJ synthetic oil ( Esso XD-3 Extra) in all of them but my concern is with cat/02 poisoining. Since the Starburst seems to have more to do with fuel economy that engine protection, I think I can probably live without API Starburst oils in these engines.

Can anyone tell me if CJ-4/SM synthetic HDEOs will cause cat/O2 failure quicker than the SL/SJ PCMOs specified for these engines.

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#1443835 - 04/24/09 08:22 AM Re: diesel motor oil in a gas engine [Re: fraso]
fito Offline


Registered: 12/04/08
Posts: 134
Loc: Wi
Mobil 1 Turbo Diesel Truck 5W-40 would be a great oil for Muscle cars.

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#1443914 - 04/24/09 09:38 AM Re: diesel motor oil in a gas engine [Re: fito]
hustler Offline


Registered: 10/04/08
Posts: 81
Loc: Dallas
search for delvac-1 and rotella synthetic UOAs and you'll quickly see why its a great choice for my track car.
_________________________
250whp turbo Miata track toy/Ferrari substitute
5w40 Rotella Synth
AMSoil MTG
M1 75w90
ATE Blue/200

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#1443944 - 04/24/09 10:16 AM Re: diesel motor oil in a gas engine [Re: hustler]
fraso Offline


Registered: 03/03/09
Posts: 153
Loc: Fort Erie, ON
Does your track car have a catalytic converter and does it need to pass any e-tests?

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#1444035 - 04/24/09 11:24 AM Re: diesel motor oil in a gas engine [Re: fraso]
OVERKILL Online   content


Registered: 04/28/08
Posts: 25904
Loc: Ontario, Canada
 Originally Posted By: fraso
Does your track car have a catalytic converter and does it need to pass any e-tests?


Doesn't matter if it doesn't burn oil.

I run TDT in all my vehicles.
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