Exhaust leak

The leak at the manifold will get worse, I wouldn't worry so much about the dpf. If its a leaking manifold or manifold gasket yes you are losing some power and some mpg how much I don't know. More than likely with a small leak at manifold it will only leak when cold then seal when it gets hot. If the gasket lets go it will be a show stopper no doubt. It may last a month or longer like it is who knows. Just seeing a small residue I doubt you are losing enough to know any different.

 

Exhaust leaks lead to loss of heat for the aftertreatment system which leads to insufficient regens which leads to check engine lights which leads to getting towed to a shop due to the truck being derated so I would say get them fixed.

 

Should be more worried about your health not the mpg / I have a Volvo 2008, with Volvo D13 motor ,I replaced the exhaust manifold 3 times; 2000+$ job/ All this new trucks have high manifold backpressure and are leaking sooner or later. I use a smoke,heat carbon monoxide alarm in my sleeper all the time, I don't trust this new trucks and the alarm went off a 5-6 times while parked idling and sleeping . Volvo trucks take fresh air for engine through the intake located outside in front of the hood, but the cab air filter for driver .,.... is located under the hood, next to windshield, pushing all the fumes leaking from engine in the cab; the engine needs fesh air, who cares about the drivers,we are expandable; I would fix it asap, the carbon monoxide can kill quickly , and diesel fumes are causing cancer.

 

It depends on how bad the leaks were and how you drive it. Like already mentioned, exhaust leaks hurt the regen process. Less heat means more active regens, which means more fuel. Keeping heat in the exhaust will make it easier to do passive regens, which use less fuel. Leaks can only hurt MPG, but whether or not you'll see a noticeable difference depends on many factors.

 

This is just the tip of the iceburg! Volvo exaust leaks into the cabin vents have been causing cancer! They are notorius for this, and Volvo has refused to take any design action to change things. Drivers have gone to sleep in the sleeper only to NOT wake up due to carbon monoxide asphyxiation. This happens several times a year, and yet NO CLASS ACTION suit against Volvo? What the hell is going on. They pay off the families and lawyers to keep their mouths shut and just let other drivers die in their sleep, get cancer, get poisoned while driving and fall asleep at the wheel. This is wrong, write your Congressman about this now! All Volvo's will eventually do it, because they place their blow-by tubes and exaust connections directly below the intake vent for the cabin, they could have fixed this 20 years ago, but no. The same design year after year! Please VOLVO drivers, we must start a class action lawsuit NOW!

 

Volvo exaust leaks into the cabin vents have been causing cancer You sure have something against VOLVO and had better have solid proof if they come after you for these accusations

 

******* In reply to your response that Bobtail member asltrfl made is not entirely off base!!!
The Carbon Monoxide and Toxic Fumes that come into the cab and sleeper from these leaks can cause many health problems that can even cause death and accidents. If you look at all the complaints that the NHSTB has received on the Volvo, you will find that many have been filed for problems with exhaust fumes coming into the cab and causing serious problems, and it will probably be just a matter of time until lawsuits are filed.
Volvo is not the only one having problems, Navistar is having similar problems and a class action lawsuit is
being filed because of it.
This is the information on that lawsuit:
http://www.lieffcabraser.com/Case-Center/Maxxforce-EGR-Diesel-Defects.shtml
Lieff Cabraser Heimann & Bernstein, LLP (“Lieff Cabraser”). Lieff Cabraser and our co-counsel have brought multiple class action lawsuits on behalf of all current, and former purchasers and lessees of 2008-2013 model year Navistar, Inc. vehicles equipped with Maxxforce Advanced EGR diesel Engines. If you purchased or leased one or more of these vehicles in the United States, you are a member of the class.
The lawsuit alleges that Navistar failed to disclose and subsequently concealed the defects in the Maxxforce Engine emission systems. As a result, the defects present in these vehicles were not properly disclosed by Navistar or covered under warranty. With no permanent solution available, these vehicles were and are worth less than the original price paid by class members. Our case has been consolidated with lawsuits filed by multiple other firms asserting similar claims. The consolidated case is: In re Navistar Maxxforce Engines Marketing, Sales Practices and Products Liability Litigation, 1:14-cv-10318 (N.D. Illinois).