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1986 international s1900 w/ DTI-466 B210C #5433862 05/20/20 06:09 AM
Joined: May 2020
Posts: 3
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Autodiculous Offline OP
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so for this engine it is recommended by international to run 15w40 fleetguard

I would like a synthetic but I will be using it in winter so would it be advisable to go with say a 10w or even 5w 40?

And being an older turbo diesel with 250k miles on it could I start running rotella t6? I am unsure what was used before. Could I run mobile1 extended performance instead?

any help would be great! Thank You!

Re: 1986 international s1900 w/ DTI-466 B210C [Re: Autodiculous] #5433869 05/20/20 06:20 AM
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ka9mnx Offline
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15w-40 conventional is more than adequate, Summer or Winter. 10w or 5w is not recommended or required.


2005 Ranger 3.0 - SuperTech Syn 0w-20/Motorcraft
2000 4Runner 3.4 - SuperTech Syn 5w-30/Toyota
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar
1993 F150 4.9 - SuperTech Syn 5w-30/Motorcraft
Re: 1986 international s1900 w/ DTI-466 B210C [Re: Autodiculous] #5433900 05/20/20 06:52 AM
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krismoriah72 Offline
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Originally Posted by Autodiculous
so for this engine it is recommended by international to run 15w40 fleetguard

I would like a synthetic but I will be using it in winter so would it be advisable to go with say a 10w or even 5w 40?

And being an older turbo diesel with 250k miles on it could I start running rotella t6? I am unsure what was used before. Could I run mobile1 extended performance instead?

any help would be great! Thank You!


I have had 30+ Class A trucks and never used synthetic engine oil. A few units were pushing a million miles. I have done 5 inframes and none were oil related.. all had to do with liners.

Worry more about clean air and clean fuel than synthetic oils.

Ive not heard of fleetguard.. ive heard of Super S Fleetgard.

With that being said just go with T4 15w40 its available anywhere and is stout.

Re: 1986 international s1900 w/ DTI-466 B210C [Re: Autodiculous] #5433934 05/20/20 07:39 AM
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Rob_Roy Offline
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I can't see it getting cold enough in California to require a synthetic engine oil. 15w-40 should be more than adequate. If you are worried about the occasional cold snap, an oil pan heater is another option.


2016 Ford Expedition EL Platinum
2016 Ford Expedition XLT
1999 Ford F350, V10
Re: 1986 international s1900 w/ DTI-466 B210C [Re: Rob_Roy] #5433974 05/20/20 08:57 AM
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PimTac Offline
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Originally Posted by Rob_Roy
I can't see it getting cold enough in California to require a synthetic engine oil. 15w-40 should be more than adequate. If you are worried about the occasional cold snap, an oil pan heater is another option.




It depends on where in California.


2017 Mazda CX5
Mobil 1 Annual Protection 0w20
Roki OEM filter.
Re: 1986 international s1900 w/ DTI-466 B210C [Re: PimTac] #5434515 05/20/20 07:06 PM
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dnewton3 Offline
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Originally Posted by PimTac
Originally Posted by Rob_Roy
I can't see it getting cold enough in California to require a synthetic engine oil. 15w-40 should be more than adequate. If you are worried about the occasional cold snap, an oil pan heater is another option.


It depends on where in California.

Yup - just ask the Donner party ...

Although, 15w-40 is still OK for occasional cold starts, for sure. Typically it's fine down to 20 degF with no real issues. This is a matter of not only the cold temps, but the frequency of those expected temps. If you only occasionally get down to 20F or so, then 15w-40 is fine year round. If it's 20F all winter long then a thinner 10w-30 might be better.

And ... it's not really about wear rates and those cold temps. I've got a bazillion UOAs that show wear is not greatly affected by some cold starts. What REALLY matters in a diesel is the cold-cranking ability of the rotating assembly. When it's really cold outside, that parasitic drag of thicker oil make make just that slight difference in spinning the engine not quite fast enough to get enough compression heat for ignition. In older IDI diesels, this was most certainly a concern. In modern CRD injected engines with intake heaters, it's not quite as much of an issue.

I've seen plenty of data to show that either 15w-40 and 10w-30 will work just fine year round in most any environment and service factor.


The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
Re: 1986 international s1900 w/ DTI-466 B210C [Re: dnewton3] #5435076 05/21/20 12:35 PM
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LubricatusObsess Offline
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dnewton - I am glad you are back. I remember you from 4 years ago when I was still working @ Cummins.

The issue with changing between winter and summer oils is for those that don't put on enough miles to coordinate OCI's with seasons. Which is why we use Shell Rotella T6 5W-40. Here in central MN, the high temperatures don't even get to 20 degrees for much of the winter.

Granted, the percentage of people dumb enough to live here and have lower mileage is a small portion of the overall oil change population, but it's more than just a couple of people.


Elastohydrodynamic Lubrication makes the world go 'round!
2017 Ram 2500 - PUP 0W-40, Fram XG
2011 Chev Traverse - PUP 5W-30, Fram XG
2005 Chev Kodiak C5500 - PUP 10W-30, Fram XG
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