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Old 11-12-2020, 11:45 AM   #57
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Thor Owners Club
Join Date: Oct 2020
Location: Toledo, OH
Posts: 11
Drove 560 miles home

Pretty impressed with engine so far. Drove 70-75 and got slightly over 10 MPG. Second tank pulled it back to 1500 RPM, about 66-68 MPH and got 11 MPG. Have an ABS light on which was there at purchase (dealer is reimbursing the repair) but that is a chassis issue and not engine related.

Overall, VERY quiet, air conditioning cranks, plenty of power. Way better than the gas Class A we had when I was a kid. That thing was loud, doghouse got hot, terrible mileage, underpowered, and couldn't get out of it's own way!

Hork
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Old 11-13-2020, 02:41 PM   #58
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Winnebago Owners Club
Join Date: Nov 2015
Posts: 9
No probkem here either

Quote:
Originally Posted by VestaDave View Post
The MF 7 was installed in Breeze, Nexus, Vesta, and Serrano. There may be others but the point is, all told they are in a relatively small number of Motorhomes. But remember, they were also installed in school buses and trucks. I don't know how many but my guess is that the number in service gets much bigger. Looking at this site and elsewhere there seems to be relatively few complaints about the engine. It's true, that Navistar screwed the pooch on their approach to the 2010 emissions. I believe the MF 10 and 7 were the only two motors of their line that met the standards. As a result the company is not only facing lawsuits, they lost billions in revenue!
Bottom line, the motor has performed flawlessly and no DEF needed while returning amazing Mpg ( in my opinion).
We had our Serrano for 30k with no issues, towing a 5k pound jeep. You can be certain the rubber tube connecting the air intake to the turbo will fall off at some point. The use a 5$ clamp instead of a 10$ Clamp, snd this is the source of all the internet buzz. Thor has an upgraded clamp available. Bigger clamp, and comes with glue (seriously). It won’t fall off, and then all is good. Be SURE that anyone doing an oil change knows to clamp this down well. Most will undo the clamp to get to the oil filter, and you need to be sure they really clamp it down when they are done.
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Old 11-14-2020, 07:25 AM   #59
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Thor Owners Club
Workhorse Chassis Owner
Join Date: Apr 2020
Location: St Paul, MN
Posts: 7
Quote:
Originally Posted by vnorvi View Post
We had our Serrano for 30k with no issues, towing a 5k pound jeep. You can be certain the rubber tube connecting the air intake to the turbo will fall off at some point. The use a 5$ clamp instead of a 10$ Clamp, snd this is the source of all the internet buzz. Thor has an upgraded clamp available. Bigger clamp, and comes with glue (seriously). It won’t fall off, and then all is good. Be SURE that anyone doing an oil change knows to clamp this down well. Most will undo the clamp to get to the oil filter, and you need to be sure they really clamp it down when they are done.
Recently turned 42,000 miles on our 2013 Serrano. Drove it from our home in MN to an RV park in AZ (where we plan to stay off & on during the upcoming winter) Total trip @ just under 1,800 miles, with average speed around 70 mph. Managed just over 10 mpg on the trip. The Maxxforce 7 performed flawlessly through various terrains! After replacing the often-referenced diesel turbo tube & clamp, so far we couldn't be happier with the overall performance of this motor!
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Old Yesterday, 05:45 PM   #60
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Thor Owners Club
Join Date: Oct 2020
Location: Toledo, OH
Posts: 11
Just purchased a Serrano/MF7

Well, we pulled the trigger and bought a Serrano 34M (bath and a half). Bottom line is that we love the floorplan and styling (ie. different). Drove 560 miles home from purchase, ran great. First tank ran 70-75 mph and got 10 mpg, some hills in VA/WV/PA. Second tank pulled back to 1500 rpm which was about 65-68 mph and got 11 mpg!

First impressions: Great mileage, seemed to have plenty of power, amazingly quiet once up to speed, doghouse was not hot, and factory A/C cranked!

Had two gas RVs as a kid, one Class C and one Class A and I remember them being loud, hot, and not being able to get out of their own way.

Will be counting on you guys to help me keep this rig up and running; wife and I are planning to put some money into the old gal in mods and restoration's. So far I have learned from all of you that oil changes RELIGIOUSLY at 5,000 miles are non negotiable, 1500 rpm is a sweet spot in this and most diesels, long periods of idling are very bad for this non DEF setup, and inspect the turbo clamp and replace with one available from Buddy Gamel.

You guys rock for so freely sharing info.

Hork
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Old Today, 11:29 AM   #61
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Winnebago Owners Club
Join Date: Nov 2015
Posts: 9
Oil changes

One other minor lesson we learned. When the oil is changed most mechanics will remove the turbo tube to get to the oil filter. Of these, only about half of mechanics will tighten it down well after they are done. Be sure to make sure your oil change person knows about this in advance.
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