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Old 08-21-2011, 07:17 PM   #1
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Exclamation Max Force Engine an oil maker?

Various sites, (mostly schoolo bus sites which use the Max Force engine) indicate that some of their engines "make" up to 6 quarts of oil between changes. Don't know if they drain the oil or just let accumulate. Believe this dilution cant be good for the bearing and other internal parts. Any ideas as to how wide spread this problem is?
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Old 08-21-2011, 07:45 PM   #2
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Here is a link to those complaints MaxxForce DT Fuel in Oil Issue - School Bus Fleet Magazine Forums I am not familiar with the Maxxforce family but those were DT engines. Is that the same as the ones used in Monaco's?
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Old 08-22-2011, 02:44 PM   #3
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Called Monaco regarding the issue and they said that there have been no problems with the Max Force 7. There was an issue with the 2007 Max Force engines used for school buses. However he said watch the oil "consumption" for the next 1000 miles and report any issue. Since this was a recorded response, I was on hold for 45 minutes, I couldn't ask what should be done if the oil level increased. Suppose I drain a quart or what ever to maintain the proper level.
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Old 10-18-2011, 01:27 PM   #4
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Originally Posted by rg neumann View Post
Suppose I drain a quart or what ever to maintain the proper level.
If it's a fuel oil dillution problem, I wouldn't drive it or serious enging problems would result!

A malfunctioning injector or fuel pump can allow large amounts of fuel into the oil sump; left undetected, this condition can result in a total engine failure

Read more: Diesel Engine Oil Analysis | Diesel Engine Oil Analysis |
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Old 10-19-2011, 07:03 AM   #5
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Have you experienced any increase of oil. I am in later stages of purchasing one and hope im not buying a problem. I looked at a used one it showed signs of pretty major oil leak soming from engine
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Old 10-19-2011, 07:15 AM   #6
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IF it utilizes a diesel particulate filter (DPF) or a NOx adsorber that requires regeneration, and IF the engine uses a late injection event to generate the heat required for the regeneration cycle, there's every possibility that the engine can "make oil" due to fuel dilution of the lube oil during the regeneration cycle. How much of a problem this is becomes a function of how many regeneration cycles are required. Typically, engines that are on the highway pulling a load will require significantly fewer regeneration cycles than engines in "mall cruisers" that spend most of their lives at idle and low loads.

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Old 10-19-2011, 09:35 AM   #7
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We have a Monaco Vesta 32 with Max Force 7 engine. Have put on 9600 miles, had oil change @ 4600 miles since we were traveling to Yellowstone, Glacier National Park and Canada. Have put 5000 miles and checked oil every 400-500 miles. Have seen no change in oil level. Engine appears ok, mileage with coach is 13.6 over 9600 miles. Before we went out west mileage here in Ohio averaged over 15 MPG. Coach weighs 2900#. Sorry, weight 29000 #!
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