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New Cummins H.O. TD #5409961 04/21/20 11:51 PM
Joined: Apr 2007
Posts: 51
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HighwayRanger Offline OP
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Joined: Apr 2007
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Hello,

Simple question: is there any reason for me not to use Shell Rotella T6 15-40 in my 2020 Ram 3500 with a Cummins High Output turbo diesel? This truck is our daily driver plus it has to pull our 20k fifth wheel around America. The manual recommends 10w30 oil, with a 15k OCI.

Looking for an oil choice that is easy to find anywhere, and T6 is popular and readily available. I intend to go no more than 10k OCI.

Thanks for the input!


2020 Ram 3500 Laramie LB, DRW, 4x4, H.O. Cummins TD, AISIN, 3.73
2016 DRV Mobile Suite Fifth Wheel
(2) Honda eu2000i Generators
Re: New Cummins H.O. TD [Re: HighwayRanger] #5410006 04/22/20 04:54 AM
Joined: Oct 2014
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CT8 Offline
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What oil does Cummins / owner manual recommend ? Over the road semis run semi trucks run million+ miles on miles the HDEOS from Chevron, Shell, Mobil and other reputable blenders.


2015 F150 2.7
2018 F350 6.2
Re: New Cummins H.O. TD [Re: HighwayRanger] #5410019 04/22/20 05:29 AM
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Rob_Roy Offline
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If my memory serves me correctly the manual does not suggest the use of 15w-40, but it does list 5w-40 as an alternative. Check it out.


2016 Ford Expedition EL Platinum
2016 Ford Expedition XLT
1999 Ford F350, V10
Re: New Cummins H.O. TD [Re: HighwayRanger] #5410024 04/22/20 05:41 AM
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skyactiv Offline
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I'm a semi mechanic for ups. Our yard shifter trucks that move semi trailers at the sort hubs have a 6.7 Cummins, but have a lower output. Even the 2020 Kalimar still specifies 15W40 and 250 hour OCI's. those engines hit 25k using Delo 15W40 and a.Baldwin filter before they get worn out. Use the 10w30 without concern. Drive the truck smooth and sane and the engine should outlive the truck.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 18' Elantra Sport 6 speed manual
The rude guy that points out reality


Re: New Cummins H.O. TD [Re: HighwayRanger] #5410052 04/22/20 06:50 AM
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Bighorn2500 Offline
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Go for the 5W40 Rotella T6 like the manual recommends as the alternative while under warranty.

I run the 5w40 T6 in my 6.7 year around for 10K change intervals with a Donaldson DBL7349.


2012 Ram 2500 SLT 6.7L Cummins 4x4
2018 Dodge Durango GT 3.6L 4x4
Re: New Cummins H.O. TD [Re: HighwayRanger] #5410096 04/22/20 07:58 AM
Joined: Oct 2004
Posts: 10,363
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bullwinkle Offline
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T5 10W30 is a pretty good oil, too-think with that kind of investment & towing, I would be tempted to try them both and see which one delivered better results.


06 Ram 3500 CTD 4X4(FG Venturi), 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7 (MC), 03 Merc Grand Marquis 4.6 2V(XG2), 11 Express 3500 6.0 (Fram PH10060 for now)
Re: New Cummins H.O. TD [Re: HighwayRanger] #5410105 04/22/20 08:03 AM
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Donald Offline
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I like the Delo 5W40 synthetic. I have a bypass filter. Going over 20K OCI and the UOA looks good.


2015 Ford F-250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: New Cummins H.O. TD [Re: HighwayRanger] #5410135 04/22/20 08:42 AM
Joined: Oct 2012
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Danno Offline
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If it was my truck, I would use a spec oil as recommended in the manual.
Agree with the 5W-40 recommendations.


2019 Jeep Grand Cherokee Summit 5.7L Hemi
2019 RAV4 Limited Hybrid
2016 Sorento SX V6 AWD
2010 Mazda 3 2.0L
Re: New Cummins H.O. TD [Re: HighwayRanger] #5410165 04/22/20 09:23 AM
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mattd Offline
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JMO towing 20,000 lbs I would try 15w40 in this mix with those and do a UOA. You may find that the 15w40 is more shear stable than the 5w40, and may give you the lowest iron wear. The 10w30 is the most shear stable, but these engines don’t shear the oil like a HEUI PSD.


2007 Ford F-350 4x4 6.0 PSD

ASE Master, L1, L2
Re: New Cummins H.O. TD [Re: HighwayRanger] #5410398 04/22/20 02:29 PM
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CT8 Offline
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Other that the lower starting ability of a 5W oil the 15W-40 is the better oil.


2015 F150 2.7
2018 F350 6.2
Re: New Cummins H.O. TD [Re: HighwayRanger] #5410590 04/22/20 07:09 PM
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NH73 Offline
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Go for the T6 5w40. Should be just as easy to find as 15w40. I wouldn't worry about shearing if your going to do 10k OCI.


2017 Toyota RAV4 Hybrid
2004 Ford Explorer Sport Trac
2012 Gravely ZT XL 48 w/ Kawasaki FR730
Re: New Cummins H.O. TD [Re: HighwayRanger] #5410706 04/22/20 09:11 PM
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tundraotto Offline
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I think the Rotella 5W-40 is way more impressive as an oil than the T6 15W-40 spec wise.

I would use almost any other 15W-40 than the T6 - if I went the 15W-40 route....

T6 - 5W-40 is OK with warranty spec and a great oil, so I would stay with that until warranty was up.

Re: New Cummins H.O. TD [Re: HighwayRanger] #5410840 04/23/20 02:26 AM
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Roost426 Offline
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t6 5w-40, Delo LE syn 5w-40 or M1 TDT 5w-40 all easy to find probably would use one of them

Last edited by Roost426; 04/23/20 02:28 AM.

1990 Dodge W250 5.9 Cummins -VPB 15W-40,FG LF3894

1986 Ford F350 6.9 IDI -ST15W-40,MC FL1995

1987 Jeep Comanche 4.0L -Mobile Super 5K HM10W-40,Fram TG8A

1993 Ford Ranger 2.3L -RGT5w-30,Fram FPS8A
Re: New Cummins H.O. TD [Re: HighwayRanger] #5410959 04/23/20 08:08 AM
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HDoilDude Offline
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Originally Posted by HighwayRanger
Hello,

Simple question: is there any reason for me not to use Shell Rotella T6 15-40 in my 2020 Ram 3500 with a Cummins High Output turbo diesel? This truck is our daily driver plus it has to pull our 20k fifth wheel around America. The manual recommends 10w30 oil, with a 15k OCI.

Looking for an oil choice that is easy to find anywhere, and T6 is popular and readily available. I intend to go no more than 10k OCI.

Thanks for the input!


Simple answer; no reason not to.

Here's a VOA for it.

https://www.bobistheoilguy.com/foru.../ck4-shell-rotella-t6-15w-40#Post5315970

I like to see Moly so I'm not using it but as has been suggested, tons of professional truckers out there using it without issue.

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