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03-29-2019, 07:40 PM
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#1
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Senior Member
Newmar Owners Club Winnebago Owners Club Ford Super Duty Owner Freightliner Owners Club
Join Date: Feb 2014
Posts: 5,292
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Oil Question
Regarding Rotella engine oil.....is it OK to mix T4 and T5 oils if the viscosity is the same?
__________________
BILL {aka-"Admiral"-"Deuce"-"W.D."}
2014 Itasca Ellipse 42QD, Freightliner Maxum, 450HP Cummins ISL, 3000 Allison, Roadmaster Nighthawk II, 2011 Lincoln MKX.
2012 Newmar Canyon Star (first coach) FMCA F428511.
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03-29-2019, 09:00 PM
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#2
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Member
Join Date: Mar 2019
Posts: 65
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Quote:
Originally Posted by Electra 225
Regarding Rotella engine oil.....is it OK to mix T4 and T5 oils if the viscosity is the same?
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yes
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03-29-2019, 09:05 PM
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#3
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Senior Member
Newmar Owners Club Winnebago Owners Club Ford Super Duty Owner Freightliner Owners Club
Join Date: Feb 2014
Posts: 5,292
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Thank you!
__________________
BILL {aka-"Admiral"-"Deuce"-"W.D."}
2014 Itasca Ellipse 42QD, Freightliner Maxum, 450HP Cummins ISL, 3000 Allison, Roadmaster Nighthawk II, 2011 Lincoln MKX.
2012 Newmar Canyon Star (first coach) FMCA F428511.
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03-29-2019, 09:06 PM
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#4
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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The newer is compatible with the old. But if it needs T6 then you can't use 5.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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03-29-2019, 09:19 PM
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#5
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Senior Member
Newmar Owners Club Winnebago Owners Club Ford Super Duty Owner Freightliner Owners Club
Join Date: Feb 2014
Posts: 5,292
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Thanks Dean. I have the ISL as you know. I was going to add a little T4 before travel. I was planning on sticking with the T4 here on out.....I think T5 was used in one of the oil changes. It looks to me that T4 has more "to it" than T5 comparing the reading on the Rotella jugs. Would I be thinking right?
I'm not a real "brain" on the mechanics of oils. I just zero in on what's best for a particular engine and stick with it.
Edit; oh BTW, I know there's always a debate about what's "best" too. [emoji2] But, I have heard great things about Rotella, and that's all that's ever been in this engine since purchase.
__________________
BILL {aka-"Admiral"-"Deuce"-"W.D."}
2014 Itasca Ellipse 42QD, Freightliner Maxum, 450HP Cummins ISL, 3000 Allison, Roadmaster Nighthawk II, 2011 Lincoln MKX.
2012 Newmar Canyon Star (first coach) FMCA F428511.
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03-30-2019, 05:34 PM
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#6
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Senior Member
Tiffin Owners Club
Join Date: Oct 2011
Location: The Ozarks
Posts: 1,566
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If you mixed 50% T6 (full syn) with 50% T4 (dino) wouldn't you have 100% T5 (syn blend) 
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Ret. Military/Corporate Pilot
Summers in the Ozarks-Winters in the Keys
Allegro Bus 36QSP
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