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10-19-2021, 09:47 AM
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#1
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Member
Join Date: Feb 2021
Location: Rock Hall, MD
Posts: 98
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Correct engine oil
Paperwork from Cummins that came with the new to us 07 Monaco ISL 400 reads “use high quality SAE 15-40 heavy duty oil”. I’ve read here that some use a blend or full synthetic. I use full synthetic for our much newer family vehicles-was thinking I would do the same for the MH. Was synthetic even used back in 07?
The engine was serviced before delivery to me but I don’t know what was used. Guess I should have asked or specified but this is my first DP. There was an engine, trans, coolant analysis done for the engine and gen set before purchase-no issues.
At the annual service, can I, should I go to synthetic? The engine has 75,000 mile, runs great.
Thank you!!
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Dwight & Christine
07 Monaco Diplomat SFT
ISL 400 w/Jeep Wrangler in tow
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10-19-2021, 09:55 AM
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#2
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Senior Member
Join Date: Nov 2011
Location: Full time RV'er
Posts: 5,126
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Yes, synthetic was used back even earlier than that. The RV manufacture was saving $20 per 100 gallons most likely is all.
It's your rig and do what you wish, personally, I've always switched over to fully synthetic as soon as I own a rig. There are people who swear by dino oil too though the stats & tests over the many decades it's been around (1960's) point to synthetic as being better for your engine long term.
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10-19-2021, 09:58 AM
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#3
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,311
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Cummins , does not discourage the use of synthetic motor oil , but does say that using synthetic does not extend the service interval .
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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10-19-2021, 10:06 AM
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#4
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Senior Member
Join Date: Oct 2014
Posts: 7,868
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With annual oil changes, unless you plan to drive more than recommended change interval miles, you do not need a synthetic.
An oil-related engine failure in your engine is virtually unheard of.
Very well respected choices available everywhere (including Walmart, etc):
Shell Rotella T 15-40
Delo 400 15-40
Like you, I use full synthetic in my cars, but "regular" oil in all my diesels. But only thing you will loose by using a synthetic or synthetic blend is some bills from your wallet.
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Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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10-19-2021, 10:27 AM
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#5
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Senior Member
Alpine Owners Club
Join Date: Oct 2019
Location: Hoodsport Wa
Posts: 3,114
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In no particular order...
Delo 400 15/40
Shell Rotella T15/40
Mobil Delvac 15/40
All good choices for conventional diesel motor oil.
My opinion of full synthetic in diesels mirrors Wolfe10, no real benefits.
Stick to the maintenance schedule in your manual and you'll be fine.
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2000 Alpine 36 FDS #74058
04 Jeep Wrangler TJ
"On the road to find out..."
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10-19-2021, 02:01 PM
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#6
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Senior Member
Join Date: Apr 2008
Location: Naples, Florida
Posts: 443
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If it takes one more voice to help you make a decision, then I am in full agreement with Wolfe10. For 20 years I have been changing oil on an annual basis (cummins and Onan) and never had an oil related problem. The only oil I ever used is Rotella T-4 15-40. Synthetic would be a waste of money.
Bill
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10-20-2021, 07:15 AM
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#7
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Senior Member
Monaco Owners Club
Join Date: Sep 2013
Location: Nebraska
Posts: 799
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I am a firm believer in synthetic oil as I was an Amsoil dealer in addition to my car business. My coach holds 14 gallons of oil being the Cummins ISX. I service the coach annually and maybe have 7,000 miles on the oil in a year. Cummins says you can use synthetic but not to extend the intervals so with the cost of Amsoil to only get 7,000 miles or a year out of it just didn’t make good financial sense.
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Randy & Kathy-n-Auggie
07 HR Navigator 43PBQ, 525hp Cummins ISX, 17 Ford Supercrew Ecoboost King Ranch 4x4
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10-20-2021, 07:33 AM
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#8
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Senior Member
Join Date: Dec 2019
Location: Alberta
Posts: 1,976
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Quote:
Originally Posted by Randyman1
I am a firm believer in synthetic oil as I was an Amsoil dealer in addition to my car business. My coach holds 14 gallons of oil being the Cummins ISX. I service the coach annually and maybe have 7,000 miles on the oil in a year. Cummins says you can use synthetic but not to extend the intervals so with the cost of Amsoil to only get 7,000 miles or a year out of it just didn’t make good financial sense.
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Sir,
This is the first mention of Amsoil being used in a Cummins powered coach that I have read. I am hoping to purchase a used DP after the pandemic settles down and was planning on using Amsoil. Likely will be driving 12000 miles per year. Would appreciate your thoughts. Thank you.
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Jeff and Annette Smith. Sparky, lemon Beagle.
2022 Chevy Equinox RS.
2007 Dutch Star
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10-20-2021, 07:40 AM
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#9
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Senior Member
Monaco Owners Club
Join Date: Sep 2013
Location: Nebraska
Posts: 799
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Quote:
Originally Posted by Xmcdog
Sir,
This is the first mention of Amsoil being used in a Cummins powered coach that I have read. I am hoping to purchase a used DP after the pandemic settles down and was planning on using Amsoil. Likely will be driving 12000 miles per year. Would appreciate your thoughts. Thank you.
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If it weren’t for the cost effectiveness of it for me, I certainly would use it. Their 15/40 diesel oil is a great product. I have sold my coach and gone back to a new fifth wheel and a new Ford F-350 with the Powerstroke diesel. I am getting close for my first oil change on the new pickup and it will have Amsoil put in it for sure. 13 quarts and I put way more miles on a pickup than I did the Motorhome. Randy
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Randy & Kathy-n-Auggie
07 HR Navigator 43PBQ, 525hp Cummins ISX, 17 Ford Supercrew Ecoboost King Ranch 4x4
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10-20-2021, 07:47 AM
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#10
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Senior Member
Join Date: Mar 2019
Location: Lansing MI
Posts: 2,821
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Lets see, every engine builder I have ever known, and I've known a few, recommends synthetic oil. Yes it is more expensive but it's demonstrably better oil and I think cheap insurance against engine wear. Yes I know there are folks that have gone hundreds of thousands of mile on dinosaur juice, and that's probably the norm but I also think that there are plenty of other places I'd rather save money than on engine oil. Just my dos centavos.
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An Old Fisherman
2017 Nexus Ghost 36DS, 2014 Ford F150 Long Bed
2007 Harley-Davidson Ultra Classic
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10-20-2021, 07:56 AM
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#11
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Senior Member
Join Date: Jan 2015
Posts: 516
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[QUOTE=Alpine36;5955335]In no particular order...
Delo 400 15/40
Shell Rotella T15/40
Mobil Delvac 15/40
All good choices for conventional diesel motor oil.
All these choices. Personally, I went with what Cummins uses and recommends- Valvoline Blue 15/40.
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2014 RAM 2500 CTD 6.7 Tradesman 4WD CCLB Auto
2015 Forest River Rockwood Signature Series Ultra Lite 8289WS w/ Diamond Package
Honda eu2200i generators
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10-20-2021, 08:01 AM
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#12
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Senior Member
Monaco Owners Club
Join Date: Jan 2017
Location: Utopia, TX
Posts: 500
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Quote:
Originally Posted by arcaguy
Lets see, every engine builder I have ever known, and I've known a few, recommends synthetic oil. Yes it is more expensive but it's demonstrably better oil and I think cheap insurance against engine wear. Yes I know there are folks that have gone hundreds of thousands of mile on dinosaur juice, and that's probably the norm but I also think that there are plenty of other places I'd rather save money than on engine oil. Just my dos centavos.
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Absolutely demonstrably better. And for somebody planning to get 1M mi out of a diesel engine between overhauls it definitely is cheap insurance. But if your motorhome will only ever go 250k mi in its entire lifetime, it's probably not going to make any measurable difference. IMO... If I had a gas motorhome I would definitely run syn.
Cheers,
Walter
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2003 Monaco Dynasty 42 Regal.
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10-20-2021, 10:47 AM
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#13
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Senior Member
Monaco Owners Club RV Trip Wizard
Join Date: Sep 2021
Location: Airdrie, AB
Posts: 512
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Quote:
Originally Posted by wamcneil
Absolutely demonstrably better. And for somebody planning to get 1M mi out of a diesel engine between overhauls it definitely is cheap insurance. But if your motorhome will only ever go 250k mi in its entire lifetime, it's probably not going to make any measurable difference. IMO... If I had a gas motorhome I would definitely run syn.
Cheers,
Walter
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This ^^^.
Spend the money elsewhere on the coach IMHO. You would just be dumping "down the drain" with every oil change in this case.
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10-20-2021, 10:59 AM
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#14
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Member
Join Date: Feb 2021
Location: Rock Hall, MD
Posts: 98
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Great information everyone. I now have a plan. Thank You
__________________
Dwight & Christine
07 Monaco Diplomat SFT
ISL 400 w/Jeep Wrangler in tow
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