The Ford Barn

Don · 06-24-2017, 09:20 AM

Walmart had Castrol 15/40 Diesel at $10 for 4 quarts,just wondering if there is any reason this would not work in the flathead ,is there that much difference than regular gas engine oil?

G.M. · 06-24-2017, 09:25 AM

I have used Castrol 20/50 in my old Fords for over 30 years. G.M.

Kurt in NJ · 06-24-2017, 09:34 AM

the additives in diesel oil are suitable for older engines that run 'dirty'---more additives to control acid, and carbon from blowby-----ideal for old gas engines that don't get run a lot and have less than perfect mixture control

GB SISSON · 06-24-2017, 10:28 AM

And they have extra zinc additive. I have always run either shell rotella or chevron delo 15-40 in my flatheads. My other rigs are mostly diesels so one oil keep on the shelf.

1935coupe · 06-24-2017, 11:29 AM

after I installed my fresh flatty I talked to the "oil guy" he is always quick with the answer and fast to show you in his thick spec book, he said the additive pack in diesel oils is among the best shell rotella T1 strait 30 is what he would recommend and added any diesel grade oil would be good.

4t8v8 · 06-24-2017, 04:39 PM

Sponsored Links (Register now to hide all advertisements)

Been using Mobil Del Vac 1300 15W-40 for many years in my flathead and 302. Never a problem and no sludge.

42guy · 06-24-2017, 07:22 PM

Been using Rotella for 15 years

adileo · 06-24-2017, 07:46 PM

Quote:

Originally Posted by 42guy

Been using Rotella for 15 years

Me 2 (not for 15yrs) but Rotella 15/40

Ray Balukas · 06-25-2017, 05:04 AM

15-40 here! As instructed by THE Flathead King {Walt Dupont]

4dFord/SC · 06-25-2017, 06:18 AM

Quote:

Originally Posted by 4t8v8

Been using Mobil Del Vac 1300 15W-40 for many years in my flathead and 302. Never a problem and no sludge.

x2.

supereal · 06-25-2017, 04:10 PM

Diesel oil has recently undergone a formulation change required by the manufacturers. It has reduced the amount of heavy pressure additive, and is not recommended for non diesel use. I have used Castrol 25W-40 for many years.

06-24-2017, 09:20 AM	#1
Don Senior Member Join Date: May 2010 Location: Ashland KY Posts: 1,159	Oil for diesel engines Walmart had Castrol 15/40 Diesel at $10 for 4 quarts,just wondering if there is any reason this would not work in the flathead ,is there that much difference than regular gas engine oil? __________________ DON P

06-24-2017, 09:25 AM	#2
G.M. Senior Member Join Date: May 2010 Location: Florida and Penna. Posts: 4,471	Re: Oil for diesel engines I have used Castrol 20/50 in my old Fords for over 30 years. G.M. __________________ www.fordcollector.com

06-24-2017, 09:34 AM	#3
Kurt in NJ Senior Member Join Date: May 2010 Location: on the Littlefield Posts: 6,159	Re: Oil for diesel engines the additives in diesel oil are suitable for older engines that run 'dirty'---more additives to control acid, and carbon from blowby-----ideal for old gas engines that don't get run a lot and have less than perfect mixture control

06-24-2017, 10:28 AM	#4
GB SISSON Senior Member Join Date: Jan 2014 Location: Orcas Island Washington Posts: 4,935	Re: Oil for diesel engines And they have extra zinc additive. I have always run either shell rotella or chevron delo 15-40 in my flatheads. My other rigs are mostly diesels so one oil keep on the shelf. __________________ Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson)

06-24-2017, 11:29 AM	#5
1935coupe Member Join Date: Sep 2014 Location: maryland Posts: 46	Re: Oil for diesel engines after I installed my fresh flatty I talked to the "oil guy" he is always quick with the answer and fast to show you in his thick spec book, he said the additive pack in diesel oils is among the best shell rotella T1 strait 30 is what he would recommend and added any diesel grade oil would be good.

06-24-2017, 04:39 PM	#6
4t8v8 Senior Member Join Date: Nov 2011 Location: NW Arkansas Posts: 524	Re: Oil for diesel engines Sponsored Links (Register now to hide all advertisements) Been using Mobil Del Vac 1300 15W-40 for many years in my flathead and 302. Never a problem and no sludge.

06-24-2017, 07:22 PM	#7
42guy Senior Member Join Date: May 2010 Location: New York State Posts: 289	Re: Oil for diesel engines Been using Rotella for 15 years

06-25-2017, 05:04 AM	#9
Ray Balukas Senior Member Join Date: Jul 2011 Location: Deerfield N.H. Posts: 294	Re: Oil for diesel engines 15-40 here! As instructed by THE Flathead King {Walt Dupont]

06-25-2017, 04:10 PM	#11
supereal Senior Member Join Date: Jul 2014 Location: Iowa Posts: 1,634	Re: Oil for diesel engines Diesel oil has recently undergone a formulation change required by the manufacturers. It has reduced the amount of heavy pressure additive, and is not recommended for non diesel use. I have used Castrol 25W-40 for many years.