Notices
Like Tree5Likes

Diesel oil vs. Gas oil

Old 06-11-2019, 11:29 AM
  #1  
Senior Member
Thread Starter
 
Join Date: May 2016
Location: Texas
Posts: 959
Default Diesel oil vs. Gas oil

Not sure if this has been asked before but I'm curious..

I know a lot of foreign cars like Audi and BMW call for 5w40 synthetic oil. I know Castrol makes it, and I've seen Mobil 1 too.

I also know synthetic diesel oil like Rotella T6 is also 5w40 synthetic. Do y'all think a diesel would be alright with Castrol/Mobil 5w40 or is there a difference? And vise versa (a BMW running Rotella T6.) Just something I've wondered about, not sure if synthetic diesel oil is special for diesel or not.
Manoverboard123 is offline  
Old 06-11-2019, 11:49 AM
  #2  
Senior Member
 
Join Date: Apr 2012
Location: Miami, FL
Posts: 1,260
Default

I can tell you the Rotella T6 is a favorite oil among the motorcycle world
mrcllusb likes this.
VTXrider is offline  
Old 06-11-2019, 11:57 AM
  #3  
Senior Member
 
Join Date: Sep 2007
Location: Winter Haven, FL
Posts: 1,988
Default

I know this does not answer your question directly, but I have a mud motor and the consensus among many of the guys who mod the engines for higher performance is to use Rotella T4. So it is fine in a gas engine... But, new vehicles are picky on oil and I would suggest filling it with whatever the manufacturer tells you too.
Troutman561 is offline  
Old 06-11-2019, 12:00 PM
  #4  
Senior MemberCaptains Club Member
 
Join Date: Jan 2007
Location: Tampa Florida
Posts: 4,820
Default

the oil is the same, its the additional stuff added in the oil that makes it different. better wear properties, ect... i run t6 in everything i own diesel or gas.
Manoverboard123 likes this.
Rolandt03 is online now  
Old 06-11-2019, 12:42 PM
  #5  
Senior Member
 
Join Date: Aug 2011
Posts: 1,088
Default

If you have any lubrication questions, is where all the petroleum engineers hang out. They often write about marine oils there.

Many high hour fishing fleets use Rotella and other "Universal" or diesel oils in their boats because of the low cost, especially in bulk. You just cannot use such oils in any engine that has a catalytic converter.

I used Rotella in my F150 on the first oil change, but I'm now running Mobil 1 EP (Extended Performance), a superior motor oil.
Bamaman is offline  
Old 06-11-2019, 12:51 PM
  #6  
Admirals Club Admiral's Club Member
 
Join Date: Nov 2009
Location: RI
Posts: 909
Default

Originally Posted by Bamaman View Post
If you have any lubrication questions, is where all the petroleum engineers hang out. They often write about marine oils there.

Many high hour fishing fleets use Rotella and other "Universal" or diesel oils in their boats because of the low cost, especially in bulk. You just cannot use such oils in any engine that has a catalytic converter.

I used Rotella in my F150 on the first oil change, but I'm now running Mobil 1 EP (Extended Performance), a superior motor oil.
Rotella is low cost?
Where?

BillTex is offline  
Old 06-11-2019, 02:46 PM
  #7  
Senior MemberCaptains Club Member
 
Join Date: Dec 2007
Location:
Posts: 11,140
Default

I've been running Mobil 1 5w40 for turbo diesels in my truck for 401,000 miles now, less the first year or so when they didn't make that oil yet. It is a diesel though.
Back-in-Black is offline  
Old 06-12-2019, 02:27 PM
  #8  
Senior Member
Thread Starter
 
Join Date: May 2016
Location: Texas
Posts: 959
Default

Originally Posted by Back-in-Black View Post
I've been running Mobil 1 5w40 for turbo diesels in my truck for 401,000 miles now, less the first year or so when they didn't make that oil yet. It is a diesel though.
The mobil im talking about is the 5w40 European car formula. My question was would that work the same at the diesel oil.

By the way guys, i will not be doing this.. lol. I always run Mobil Delvac 15w40. Just something I thought of!
Manoverboard123 is offline  
Old 06-13-2019, 03:59 AM
  #9  
Senior Member
 
Join Date: Feb 2005
Location: Altha Florida
Posts: 155
Default

I heard diesel oil has higher limits of zinc or something. I had a 1995 Volvo 850 (car) that had 250,000 miles. I put that Valvoline high mileage oil in it. It developed a leak at the main seal. I started using the 15w-40 diesel oil and the leak stopped. Ran it another 100k miles before donating it to a church.
Pursuit1 is offline  
Old 06-13-2019, 07:16 AM
  #10  
Vek
Member
 
Join Date: Mar 2006
Location:
Posts: 38
Default

https://540ratblog.wordpress.com/

Food for thought...I don't know what his friction testing protocol is, but results are interesting.
Vek is offline  
Old 06-13-2019, 08:40 AM
  #11  
Admirals Club Admiral's Club Member
 
Join Date: Nov 2009
Location: Tarpon Springs, FL
Posts: 7,385
Default

The OEM's have engineers who make these recommendation based on facts. I would use what they recommend.
mikefloyd is offline  
Old 06-13-2019, 08:52 AM
  #12  
Admirals Club Admiral's Club Member
 
Join Date: Aug 2014
Location: Hanahan, SC
Posts: 7,934
Default

I run T6 in everything I own...cars, trucks, ATVs, lawnmowers, Yamaha F150, tractors, etc.

The reason it is a favorite in the motorcycle/ATV world is it is wet clutch compatible, but it is a great oil.
schoolsout1 is offline  
Old 06-13-2019, 08:53 AM
  #13  
Admirals Club Admiral's Club Member
 
Join Date: Aug 2014
Location: Hanahan, SC
Posts: 7,934
Default

Originally Posted by BillTex View Post
Rotella is low cost?
Where?
Last time I purchased, there was a $7/gal rebate on T6. Brings down to about $16/gal.
schoolsout1 is offline  
Old 06-15-2019, 04:25 AM
  #14  
Senior Member
 
WaterEnjoyer's Avatar
 
Join Date: Jun 2013
Location: South Jersey
Posts: 12,020
Default

Rotella t6 has zinc in it. Zinc can cause damage to catalytic converters.
Manoverboard123 likes this.
WaterEnjoyer is offline  
Old 06-15-2019, 08:08 AM
  #15  
Senior Member
 
Join Date: Sep 2005
Location: Spartanburg, SC
Posts: 2,235
Default

Ask this guy to do a comparison.
jeffnick is online now  
Old 06-15-2019, 05:34 PM
  #16  
Senior Member
Thread Starter
 
Join Date: May 2016
Location: Texas
Posts: 959
Default

Originally Posted by jeffnick View Post
Watch him all the time. Makes some great videos!!
Manoverboard123 is offline  
Old 06-16-2019, 08:39 AM
  #17  
Member
 
Join Date: Dec 2015
Location: S. Florida
Posts: 87
Default

Fun fact: if you find yourself in Jamaica, ask for a gallon of "gas oil" and you'll get a gallon of diesel.
Hard Bargain is offline  
Old 06-16-2019, 06:47 PM
  #18  
Admirals Club Admiral's Club Member
 
Join Date: Jan 2015
Location: Central Jersey
Posts: 217
Default

I ran t6 in my CBR600RR and now run it in my Aquatrax. Great oil, no issues.
ho1ywars is offline  
Old 06-16-2019, 07:19 PM
  #19  
Admirals Club Admiral's Club Member
 
Join Date: Nov 2009
Location: RI
Posts: 909
Default

Originally Posted by schoolsout1 View Post
Last time I purchased, there was a $7/gal rebate on T6. Brings down to about $16/gal.
That doesn’t tell me where...
BillTex is offline  
Old 06-17-2019, 11:55 AM
  #20  
Senior Member
 
Join Date: Mar 2009
Location: Homosassa, FL
Posts: 1,406
Default

You don't want to run Mobil 1 FS (European Car Formula) in a heavy-duty diesel truck engine. It only has an S (spark ignition) rating and is designed for gasoline engines and light-duty automotive diesel engines. You need to run a C (combustion ignition) rated oil in a heavy-duty diesel. Mobil 1 Truck and SUV has the C rating.

Mobil Products

Diesel oils have high levels of dispersant additives that are needed to keep soot particles suspended. Gasoline rated oils do not. They also typically contain higher levels of anti-wear additives and are blended to the higher end of each viscosity rating rather than the lower end like automotive oils.

You can typically run diesel oils in gasoline engines without problems since most have the SN rating for dual purpose fleet usage. But not the other way round.
DocStressor is offline  

Thread Tools
Search this Thread