novatz
Cross Hill, SC
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Joined: 04/07/2007
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Will check with Monaco but what is an oil recommendation for a 400ISL Cummins?
'08 40' Monaco Diplomat Superslide
'08 Chevy Silverado with Rampage loader
'05 Gold Wing
'41 Spouse
'05 Cat
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50pascals
rochester, ny
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Joined: 01/10/2008
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I run Rotella T synthetic in EVERY engine I own. gas, diesel, big or small. It is approved for all.
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The Texan
Summer: A Cool Climate Winter: A Warm Climate
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Joined: 01/16/2004
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50pascals wrote:I run Rotella T synthetic in EVERY engine I own. gas, diesel, big or small. It is approved for all. Ditto
Bob & Betsy - USN Ret'd '78 & FL LEO Ret'd '03 
FMCA #F203528
'05 HR Endeavor, 40PRQ w/400 Cummins - With -'05 GMC Sierra LT, CC Z-71, the pusher
'07 Arctic Cat 500A & Wilderness Kayak, riding in the pusher -
Our Current Location
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Deen
Vancouver, WA
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Joined: 12/07/2000
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Cummins says a diesel quality 15w40. I use Delo 400. You can use synthetic if you want but Cummins says that doesn't allow an increase in change intervals unless you have the oil analyzed. The engine will last 300,000 miles with dino oil so I don't see any benefit.
Cummins makse the engine, not Monaco so I follow the Cummins recommendations.
Deen - Vancouver, WA
'02 Dutch Star 4090 (41+', triple slide)
435/1200 ISC Cummins/Banks PowerPak
'08 Honda Civic/dolly
'05 Honda Odyssey/dolly
NRA Benefactor Life Member
FMCA f47302s, Life Member: Good Sam,
Newmar DP Owners Group
51st yr of RV'ing
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CaBoy
Junction City, OR USA
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Joined: 02/20/2003
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The Texan wrote:50pascals wrote:I run Rotella T synthetic in EVERY engine I own. gas, diesel, big or small. It is approved for all. Ditto
Hey Texan, how much a gallon does it cost? Been running Delo 400, 15W-40 for a long time but have thought about synthetic.
The older I get, the better I used to be.
1997 Prevost by Country Coach
470 HP Series 60 Detroit / 6 SP. Allison
2005 Jeep Grand Cherokee Toad
Same Co-Pilot for 43 years
2 Boston Terrier girls, Scooter & Mia
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Dynasty40
Hangtown, Northern California
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Joined: 02/07/2008
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Just curious..I found Rotella T but it doesn't indicate its synthetic??  Is it or not ??? and where can you buy it??? WW says its unavailable..thanks for your help...Dennis
Dennis and Debi
Monaco Dynasty Baron 40PFD
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Warren&Karen
Austin, Texas
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Joined: 05/25/2004
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Delo also makes a synthetic blend in 15-40.
Karen and Warren
"Counting the days 'til retirement"
Sophie and Sam, our two Yorkies
Austin, Texas is home. Also, look for us
in Rockport / Fulton on the Texas coast
2003 38GH model Tiffin Phaeton
2004 Jeep Wrangler Sahara
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Turbo Diesel Dude
Green Mountain, NC
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Joined: 01/10/2005
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Rotella T either 15W-40 regular or 5W-40 synthetic. Wally World has it.
charles weidman
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Richard Pelletier
Chesapeake, VA, USA
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Joined: 03/21/2002
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Rotella T 15W-40 regular every 12 months or 15,000 miles.
2005 40 ft Monco Knight PLQ 4 slides
2002 2500HD Crew Cab 8'bed 4X4
Duramax/Allison (A BIG TOAD)
Richard and Susan
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Sully2
Cincinnati
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Joined: 01/20/2003
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CaBoy wrote:The Texan wrote:50pascals wrote:I run Rotella T synthetic in EVERY engine I own. gas, diesel, big or small. It is approved for all. Ditto
Hey Texan, how much a gallon does it cost? Been running Delo 400, 15W-40 for a long time but have thought about synthetic.
If you are doing the oild and filters on a proper, regular basis you wont gain anything by going to a SYN oil in these larger motors. SMALL engine..different story ORRR..if you live somewhere that you HAVE TO start and run the engine in a COLD climate.
I DID switch my genset ( Kubota engine) this last year from dino fat to SYN ( 5W-40) and also use the same in my small Kubota tractor...both of which I "use" in the winter for various reasons.
I use Delo 15W-40 in the RV...Rotella 5W-40 in the Kubota engine stuff.
2000 Country Coach Allure; Cummins ISC 330 HP; 71/2 - 8 MPG regardless
2002 Jeep Liberty
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