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RV Freightliner Cummins ISB 6.7 oil question #5328681 01/21/20 11:48 AM
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1978elcamino Offline OP
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My parents have a new Tiffin Allegro with the Cummins ISB 6.7, its a Freightliner chassis. The RV is in Florida and will spend most of the time east of the rockies. I tried to look on the website for service information but Tiffin is really lacking on this material. Since this will be under constant load ( heavy RV ) and spend most of the time in warm weather what oil would be good to use? Also, OCI's? I was thinking Rotella T 15w40 @ 7500 miles, any suggestions?


2018 F150 5.0
2016 Ford Fusion 2.5
Re: RV Freightliner Cummins ISB 6.7 oil question [Re: 1978elcamino] #5328694 01/21/20 12:04 PM
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dnewton3 Offline
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Any API CK-4 will do. The Rotella is a decent choice, as are many others.

I would think the chassis has a vehicle prognostics system and probably includes an IOLM. Follow that.

Skip the Tiffin and go right to the Freightliner site.
https://www.fcccrv.com/parts-and-service/


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: RV Freightliner Cummins ISB 6.7 oil question [Re: 1978elcamino] #5328701 01/21/20 12:12 PM
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kschachn Offline
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And surely the owner's manual gives an oil specification, approval or license, does it not? I'd follow that in order to do what I could to comply with warranty requirements for such an expensive new vehicle (and engine).

Unless you wish to tell the service advisor you were counseled to do differently based on advice you received on an Internet chat board.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: RV Freightliner Cummins ISB 6.7 oil question [Re: kschachn] #5328707 01/21/20 12:18 PM
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CT8 Offline
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The above two posts advise would be wise to follow.


2015 F150 2.7
2018 F350 6.2
Re: RV Freightliner Cummins ISB 6.7 oil question [Re: 1978elcamino] #5328732 01/21/20 12:35 PM
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Chris142 Offline
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A friend of mine runs a hot shot trucking business. He uses Dodge trucks with that same basic 6.7 cummins. He runs rotella 5w40 year round and has never had any engine problems. Its the transmissions that are the problem.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: RV Freightliner Cummins ISB 6.7 oil question [Re: 1978elcamino] #5328763 01/21/20 01:05 PM
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02SE Offline
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I'm running Rotella 15w40 in my RAM 3500 6.7 Cummins powered Dually. Pretty much all it does is pull the 26k+ 5th wheel. 35k+ GCVW. Ambient temps from around 0° to 100°+ F. I change it based on time, rather than miles. No problems.

Re: RV Freightliner Cummins ISB 6.7 oil question [Re: 02SE] #5329678 01/22/20 04:32 PM
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OLEJOE Offline
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Originally Posted by 02SE
I'm running Rotella 15w40 in my RAM 3500 6.7 Cummins powered Dually. Pretty much all it does is pull the 26k+ 5th wheel. 35k+ GCVW. Ambient temps from around 0° to 100°+ F. I change it based on time, rather than miles. No problems.


Are you talking about T4, T5 or T6 Rotella? I’ve been seriously considering using T4 in my new 2500 w/6.7. The T4 Rotella is available everywhere here in the South but I don’t know about elsewhere. I’m currently running T6 15-40 but getting it is sketchy at times. I’ve only got 4K miles on it so far and having to do OCI every 6 months it’s only going to see 4-6000 miles and that’s if I’m traveling.


Jack of All Trades. Master of some.
Re: RV Freightliner Cummins ISB 6.7 oil question [Re: 1978elcamino] #5329750 01/22/20 06:06 PM
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tundraotto Offline
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Rotella T5 15W-40 is on sale at walmart and amazon for $9.55/gallon right now....

Re: RV Freightliner Cummins ISB 6.7 oil question [Re: tundraotto] #5329760 01/22/20 06:14 PM
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OLEJOE Offline
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Originally Posted by tundraotto
Rotella T5 15W-40 is on sale at walmart and amazon for $9.55/gallon right now....


Thanks. I’ll check it out.


Jack of All Trades. Master of some.
Re: RV Freightliner Cummins ISB 6.7 oil question [Re: OLEJOE] #5329815 01/22/20 07:22 PM
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02SE Offline
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Originally Posted by OLEJOE
Originally Posted by 02SE
I'm running Rotella 15w40 in my RAM 3500 6.7 Cummins powered Dually. Pretty much all it does is pull the 26k+ 5th wheel. 35k+ GCVW. Ambient temps from around 0° to 100°+ F. I change it based on time, rather than miles. No problems.


Are you talking about T4, T5 or T6 Rotella? I’ve been seriously considering using T4 in my new 2500 w/6.7. The T4 Rotella is available everywhere here in the South but I don’t know about elsewhere. I’m currently running T6 15-40 but getting it is sketchy at times. I’ve only got 4K miles on it so far and having to do OCI every 6 months it’s only going to see 4-6000 miles and that’s if I’m traveling.


T4.

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