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1986 international s1900 w/ dana spicer international ra47 rear axle #5433878 05/20/20 06:27 AM
Joined: May 2020
Posts: 3
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Autodiculous Offline OP
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international recommends an 85w140 but I cant find a full synthetic at that exact weight. would there be any detriment in using mobil1 75w140 instead? as far as I understand the 140 is the main number the other is flow rate while cold which may help it during winter a bit or is there more to the cold weight than that?

would you recommend mobil1 synthetic or some other brand for this rear axle and diff?

Thank You ahead of time for your suggestions and insights!

Re: 1986 international s1900 w/ dana spicer international ra47 rear axle [Re: Autodiculous] #5433917 05/20/20 07:15 AM
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krismoriah72 Offline
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Originally Posted by Autodiculous
international recommends an 85w140 but I cant find a full synthetic at that exact weight. would there be any detriment in using mobil1 75w140 instead? as far as I understand the 140 is the main number the other is flow rate while cold which may help it during winter a bit or is there more to the cold weight than that?

would you recommend mobil1 synthetic or some other brand for this rear axle and diff?

Thank You ahead of time for your suggestions and insights!


Why do you want/need a full synthetic? Are you doing long hauls and changing every 100K miles?

I wouldnt want to spend a bunch of money on synthetic rear diff oils and have a wheel seal blow, and have to chase down a synthetic.


Your 1986 S1900 will not last any longer or run any better on full synthetics..

Put your efforts towards good oil filters, fuel filters and air filters. Check fluids often.. run it and keep an eye on it.

Re: 1986 international s1900 w/ dana spicer international ra47 rear axle [Re: Autodiculous] #5433932 05/20/20 07:38 AM
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Rob_Roy Offline
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Unless you are operating the truck in cold weather or are looking for the extended drain capabilities of a synthetic, 85w-140 will work just fine. 80w-140 synthetic is available at most truck stops or oil distributors if you decide to go that route.

Do not forget the cooling system when servicing your truck.


2016 Ford Expedition EL Platinum
2016 Ford Expedition XLT
1999 Ford F350, V10
Re: 1986 international s1900 w/ dana spicer international ra47 rear axle [Re: Autodiculous] #5434178 05/20/20 01:26 PM
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CT8 Offline
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Lots of referring to winter.where in California do you live / operate the vehicle in? You have a 1986 truck and what are you worrying about ?


2015 F150 2.7
2018 F350 6.2
Re: 1986 international s1900 w/ dana spicer international ra47 rear axle [Re: Autodiculous] #5434835 05/21/20 07:18 AM
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ka9mnx Offline
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SuperTech conv or syn 75w-140. Readily available and reasonable.


2005 Ranger 3.0 - SuperTech Syn 5w-30/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
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