Jump to content
MWeiner

High Mileage Diesels

Recommended Posts

Unlike conventional gas engines, diesel engines have been known for going beyond 350,000 to 500,000 miles and sometimes even further...   PLUS, when factoring values on NADA, (National Automobile Dealers Association), they tell you that mileage is only to be used for consideration with gas engines only.... 

SO, how many of you with diesel engines have exceeded 250,000 and what's your experience been with repairs, maintenance, performance, and  oil consumption?  

At what mileage did you consider the diesel engine to be "broken in" and running at top condition?    And, what would you consider the top RPM range for cruising?    My 3 litre V6 Mercedes Benz Sprinter goes about 2,500 at 60 or 65 MPH....

Share this post


Link to post
Share on other sites

Going to be a lot of "apples and oranges" comparisons here.

Your 3 liter MB diesel has little resemblance to the diesels found in most Class A motorhomes.

The Class A diesels are all in-line 6 cylinders with displacement from 6.7 to 15 liters.  The longer the stroke the lower the RPM at which maximum torque is generated, the lower the RPM for maximum HP and the lower the RPM for governed RPM.

And, yes, the larger of these large diesels are the same as in OTR trucks that often go over a million miles before in-frame overhauls.

Sure, they can fail, but for most RV's, the coach will wear out long before the engine. Same goes for the Allison transmission. Most failures are due to neglect or driver abuse.

This takes nothing away from the excellent drive train in your Sprinter-based RV, but they ARE different.

 

Share this post


Link to post
Share on other sites

"This takes nothing away from the excellent drive train in your Sprinter-based RV, but they ARE different."

Thanks for your reply.... Of course, they're completely different in scale.... and I imagine that the large 6.7 Cummins Diesel engines turn at a lower RPM.. and also consume more fuel, BUT,  recently on a trip back through the local mountains, I noticed that climbing to 5,000 feet the 3 litre Diesel was hardly breathing hard compared to my Subaru Outback Limited CVT with the 2.5 that had to run at nearly twice the RPMs to keep up on the hill climb that I did months earlier pulling a 1,000 pound teardrop trailer.  

Don't really know what transmission Mercedes Benz uses in the Sprinter EXCEPT that they claim it's "heavy duty".... It is pretty smooth..and it has selectable speeds right on the gear shifter.   I don't use that for acceleration.. only to shift down to slow down on grades... For most instances, I just gradually accelerate fast enough and keep the RPMs as low as possible... 

I'm not sure I'll go another 1,000,000 miles even though some engines might (LOL), we'll see... BUT, it appears that mileage on Diesel vehicles in general is LESS of a factor than your typical gasoline engines... Correct?  

I would be very pleased if the Mercedes Benz Sprinter had the capability to go 350,000 miles....

If you know anything about who makes the MB transmission, maybe it's an in-house product, let me know... 

Thanks, ---Mark

 

 

Share this post


Link to post
Share on other sites

I don't mean this as a put down, but you can get far better answers from Roadtrek Tech Department than from most of us.  I think your transmission is by Daimler and you should have no problem reaching 350,000 miles on your unit.  :) 

Share this post


Link to post
Share on other sites

Carl, no problem

Yes, I can certainly call Roadtrek when it's a Roadtrek issue. 

I suspect that you're correct...it's likely a Mercedes Benz transmission in house unit? 

Just got an appointment  tomorrow for the Takata air bag replacement on the driver's side... I'll ask them about the transmission.    I appreciate your honest response of not knowing.. but, I was kinda hoping that someone on the FMCA forum does know the answer? 

Maybe, these coaches are not that ubiquitous here on the FMCA?  

I noticed that there was a Roadtrek discussion, but, that was several years ago.. maybe these people have moved on? 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...