Sully2
Cincinnati
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Joined: 01/20/2003
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novatz wrote:Will check with Monaco but what is an oil recommendation for a 400ISL Cummins?
CUMMINS "recommends" ( ahem!) their preferred oils made by Valvolene which are "Premium Blue 15W-40..OR..Premium Extreme Blue which is a SYN 5W-40. And to them it makes no difference since with either you are supposed to do your oil / filters changes per their instructions ( same intervals for either)
2000 Country Coach Allure; Cummins ISC 330 HP; 71/2 - 8 MPG regardless
2002 Jeep Liberty
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Ivylog
Blairsville, Ga. USA
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Joined: 06/30/2004
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Having asked semi truck engine rebulder which oil is best... At a million miles those using Delo 400 have very little buildup. Shell Rotella T is next with a slight amount. I buy Rotella T at Sam's by the 55 gal barrel. Last two barrels of Rotella T I paid $250, should have bought more as they are now $500. Fortunately oils have improved to where in a DP it probably makes no difference as long as you use the right spec oil.
04 Monaco Dynasty 42' quad slide
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gunny357
North Carolina
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Joined: 04/06/2005
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Just be sure that the oil has the API classification called for in the engine manual. You are looking for something on the order of CJ-4, CH, etc. You shoul dbe able to find it on the label of the container and may include some other classifications such a SK, SJ.
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Sully2
Cincinnati
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Joined: 01/20/2003
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gunny357 wrote:Just be sure that the oil has the API classification called for in the engine manual. You are looking for something on the order of CJ-4, CH, etc. You shoul dbe able to find it on the label of the container and may include some other classifications such a SK, SJ.
OR a new, better classification!
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havasufun
Big Bear Lake, Ca (Snow Summit)
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Joined: 03/13/2002
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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.
That's what I use on my ISL and I do my own oil changes.
Paul
2004 Alfa See Ya Gold 40' 400 ISL, Hummer H3 Toad,Ram 1500 4X4 Quad Cab Toad, 24' Hallmark Cargo Trailer, 20' Carson Toy Hauler when we need the extra room.
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havasufun
Big Bear Lake, Ca (Snow Summit)
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Joined: 03/13/2002
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Dynasty40 wrote: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
Walmart has it every time I go to buy.
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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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The last time I purchased Rotella-T synthetic at WalMart, it cost $13.85/gal, but I would imagine that it has gone up just like other oil products. If it goes to high, the Cummins ISL will go back to regular Rotella and the PSD and GMC 5.3 will be the only ones getting the synthetic Rotella.
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, riding in the pusher -
Our Current Location
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grm77979
South Texas
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Joined: 07/12/2004
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Sully 2
What is the 5W-40 Syn oil that you use. I have not seen any oil with that much of a weight spread.
Glen
1997, 40' Mountain Aire DP, one slide
325 Cummins, 6 speed Allison
Toad - Jeep Wrangler
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