Question on 15w40 engine oil…diesel oil ok?

[sleepycruiser]

My last oil change I used 10w40. I changed it about 6 months ago and put minimal miles on it, but thinking about putting some thicker oil since it is getting colder and maybe I will see less drops underneath (very minimal dripping now).

I’m also reading contradicting amounts for a 1964 F (135) engine. I’ve read 7.5 quarts and I’ve read 9. I can’t recall what I put in last time. I’ll have to reuse the drain bolt gasket if I want to get it done today.
Is this ok to use? Looks like it should work in diesel and gasoline engines.

Super Tech Heavy Duty SAE 15W-40 Motor Oil, 1 Gallon - Walmart.com

Buy Super Tech Heavy Duty SAE 15W-40 Motor Oil, 1 Gallon at Walmart.com

www.walmart.com

 

[WarDamnEagle]

thinking about putting some thicker oil since it is getting colder

Your logic is contrary to the normal manufacturer's recommendations: higher viscosity in summer and lower viscosity in winter. Given today's modern multi-viscosity blends, I'm not sure that's sound advice anymore. I would think you wouldn't want to go higher than 10W40 but you will get all kinds of different opinions on this subject.

If you're looking for good and relatively cheap, I would think this Shell Rotella diesel 10W30 would be a good choice:

https://www.tractorsupply.com/tsc/product/shell-rotella-t-triple-protection-10w-30-engine-oil-1-gal-1079984?cid=Google-Shopping&utm_source=google&utm_medium=shopping&BU=TSCO&utm_content=BAU&adtype=pla&campaignid=20387647901&device=c&product_channel=local&product_id=1079984&store_code=1483&gad_source=1&gad_campaignid=20382437754&gbraid=0AAAAADnTm20YFFSTTXqNDdIzHmIUVvRBp&gclid=CjwKCAjwz5nGBhBBEiwA-W6XRDtpT7HRS-vOxShAt_c6f2BtOLYwt5tasgcbM1nEFrubHpECtGdWjBoCAUwQAvD_BwE

 

[sleepycruiser]

Your logic is contrary to the normal manufacturer's recommendations: higher viscosity in summer and lower viscosity in winter. Given today's modern multi-viscosity blends, I'm not sure that's sound advice anymore. I would think you wouldn't want to go higher than 10W40 but you will get all kinds of different opinions on this subject.

If you're looking for good and relatively cheap, I would think this Shell Rotella diesel 10W30 would be a good choice:

https://www.tractorsupply.com/tsc/product/shell-rotella-t-triple-protection-10w-30-engine-oil-1-gal-1079984?cid=Google-Shopping&utm_source=google&utm_medium=shopping&BU=TSCO&utm_content=BAU&adtype=pla&campaignid=20387647901&device=c&product_channel=local&product_id=1079984&store_code=1483&gad_source=1&gad_campaignid=20382437754&gbraid=0AAAAADnTm20YFFSTTXqNDdIzHmIUVvRBp&gclid=CjwKCAjwz5nGBhBBEiwA-W6XRDtpT7HRS-vOxShAt_c6f2BtOLYwt5tasgcbM1nEFrubHpECtGdWjBoCAUwQAvD_BwE

Worst day of my life…getting corrected by an Auburn fan! Haha!!

But yes, you are correct. Too early this morning. I don’t drive it very often in the winter, so mainly want to stop the few drips with thicker oil.

 

[Godwin]

No problem running diesel oil such as Shell Rotella in a F engine. I have a rebuilt 2F that has > 300k miles on it that I have mainly used Rotella 15-40 in it. For your area the 10-30 would be a better choice.

 

[sleepycruiser]

No problem running diesel oil such as Shell Rotella in a F engine. I have a rebuilt 2F that has > 300k miles on it that I have mainly used Rotella 15-40 in it. For your area the 10-30 would be a better choice.

Thanks. I might just keep the 10-30 then.

Edit: actually I used 10-40 last time.

 

[GA Architect]

Worst day of my life…getting corrected by an Auburn fan! Haha!!

But yes, you are correct. Too early this morning. I don’t drive it very often in the winter, so mainly want to stop the few drips with thicker oil.

"Being Rebellious"

FWIW - I have an '86 2F rebuilt, and installed in my rig about 10 years ago, I've run nothing but 20W50 since.....that was on the recommendation of the engine builder. Also, I daily drive my 40 year around.

 

[Godwin]

"Being Rebellious"

FWIW - I have an '86 2F rebuilt, and installed in my rig about 10 years ago, I've run nothing but 20W50 since.....that was on the recommendation of the engine builder. Also, I daily drive my 40 year around.

Heretic.

I had a 22R, bought it with ca. 25k on it, when I sold it it had > 200k and I ran Castrol 20-50 during that time.

 

[jimoldguy]

It seems to me that your concern is oil leaks: leaking gaskets, seals, o-rings may be able to be fixed with an oil additive for leaks, but it is temporary at best. Thicker oil will not fix a leak. Leaks need to be fixed with new sealants, seals, gaskets, and whatever. Disassembly required. New parts required. Find the leak. It may be simple. A rear main is a major PIA.

 

[rainingagain]

"Being Rebellious"

FWIW - I have an '86 2F rebuilt, and installed in my rig about 10 years ago, I've run nothing but 20W50 since.....that was on the recommendation of the engine builder. Also, I daily drive my 40 year around.

This. 20W50 all day long where I am located.

This has a zinc additive so you are good there with the flat tappet cam.

 

[trainbufftony]

I use 15w40 dello for the zinc.
Diesel motor oils must withstand a lot more pressure than gas engine oils.
Dello is available cheap locally and I keep it around to run in our Diesel engines too.
How do you tell you're handling a "Diesel" motor oil?

The API certification will be either c followed by a letter or s followed by a letter.
C for compression ignition
S for spark ignition.
The letter after that denotes the grade. Closer to z is a better quality oil according to the American petroleum institute.