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Old 11-11-2016, 05:49 PM   #1
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Oil questions for Cummins ISB 8.3

Hey Everyone,

I will be headed down to pick up my Bluebird shortly. It has always been my practice to carry spare belts, filters and oil when on the road. This trip will be no different.

My concern is regarding oil.

I just found out that I will not be picking the bus up at the service shop but at the State surplus center instead. If I was picking up at the service shop I would simply ask what oil they were using and get some of that.

As I will not have that information available I am concerned that I don't know if they were running dino or synthetic and what weight. If I buy Rotella 15-40 and they have been running some flavor of synthetic will I cause a problem if I add oil?


Any thoughts?

Thanks.

S.
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Old 11-11-2016, 06:30 PM   #2
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if its topped off its all good, if it needs oil get an oil change. save some of the old oil and get it tested when you get home, it will tell you what type of oil it was and what condition your motors in. good luck
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Old 11-11-2016, 06:37 PM   #3
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Originally Posted by superdave View Post
if its topped off its all good, if it needs oil get an oil change. save some of the old oil and get it tested when you get home, it will tell you what type of oil it was and what condition your motors in. good luck
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Thanks for the input.

My concern is if I have to add oil on the trip home. I may be adding a significantly different oil.
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Old 11-11-2016, 08:03 PM   #4
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This question is better answered by the full Hive. If you're just topping off then it doesn't really matter:

Can I Mix Synthetic and Conventional Oil? | AMSOIL Blog
What Happens if You Mix Regular and Synthetic Oil?
Motor Oil: Synthetic vs. Non-Synthetic

Stick with 15w-40 and you'll get home fine (or at least that won't be a primary problem )
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Old 11-12-2016, 10:42 AM   #5
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Quote:
Originally Posted by jazty View Post
This question is better answered by the full Hive. If you're just topping off then it doesn't really matter:

Can I Mix Synthetic and Conventional Oil? | AMSOIL Blog
What Happens if You Mix Regular and Synthetic Oil?
Motor Oil: Synthetic vs. Non-Synthetic

Stick with 15w-40 and you'll get home fine (or at least that won't be a primary problem )
Thank you!! Good info!
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Old 11-12-2016, 12:15 PM   #6
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I wouldn't hesitate at all to top it off with Rotella if I didn't know what was in it.

And just to help you avoid any confusion at parts counters, etc... The engine you have is an ISC. The Cummins ISB is a 3.9, 5.9, or 6.7.
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Old 11-12-2016, 12:55 PM   #7
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Originally Posted by Rameses View Post
I wouldn't hesitate at all to top it off with Rotella if I didn't know what was in it.

And just to help you avoid any confusion at parts counters, etc... The engine you have is an ISC. The Cummins ISB is a 3.9, 5.9, or 6.7.
Thanks for pointing out my typo

Mechanical
6C=8.3
6B=5.9
4B=3.3 & 3.9

Electronic
ISB=5.9/6.7
ISC=8.3
I have not seen an electronic 3.3 or 3.9???
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Old 11-12-2016, 06:17 PM   #8
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Originally Posted by PNW_Steve View Post
Thanks for pointing out my typo

Mechanical
6C=8.3
6B=5.9
4B=3.3 & 3.9

Electronic
ISB=5.9/6.7
ISC=8.3
I have not seen an electronic 3.3 or 3.9???
Yeah, the electronic 16 valve 3.9 was only made for a couple years and is pretty damned rare.

They were used in generators, pumps, and construction equipment (mostly Case loaders).

They stopped making them and replaced them in the applications they'd been using them for with either the 3.3 or 4.5 (also both electronic) depending on how much power was needed. Reason behind that change was something to do with the new engines falling into different emissions categories than the 3.9 did.
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Old 11-13-2016, 08:46 PM   #9
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Quote:
Originally Posted by Rameses View Post
Yeah, the electronic 16 valve 3.9 was only made for a couple years and is pretty damned rare.

They were used in generators, pumps, and construction equipment (mostly Case loaders).

They stopped making them and replaced them in the applications they'd been using them for with either the 3.3 or 4.5 (also both electronic) depending on how much power was needed. Reason behind that change was something to do with the new engines falling into different emissions categories than the 3.9 did.
Interesting stuff!!

One of these days when I get the time...... I would love to build a 4BT powered rat rod. Too many hobbies....
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Old 11-13-2016, 10:57 PM   #10
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Interesting stuff!!

One of these days when I get the time...... I would love to build a 4BT powered rat rod. Too many hobbies....
That would be AWESOME.
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