mdrake67 Posted January 27, 2021 Share Posted January 27, 2021 I have a 2012 Mack CXU613 with MP7 and it has a drinking problem. I have oil disappearing, no visible leaks, nothing on the ground under it while it sits but if you don't keep a close eye on it you will run out of oil. Its not burning it or at least not showing it out the stacks. Anybody had this issue or know what to even start checking. Quote Link to comment https://www.bigmacktrucks.com/topic/65693-mp7-disappearing-oil/ Share on other sites More sharing options...
Vmac3 Posted January 30, 2021 Share Posted January 30, 2021 On 1/27/2021 at 11:40 AM, mdrake67 said: I have a 2012 Mack CXU613 with MP7 and it has a drinking problem. I have oil disappearing, no visible leaks, nothing on the ground under it while it sits but if you don't keep a close eye on it you will run out of oil. Its not burning it or at least not showing it out the stacks. Anybody had this issue or know what to even start checking. Some oil consumption is normal between oil changes. How much oil is disappearing? From what it sounds like you have a part failure somewhere. If no visible leaks are found you could check the air compressor. If you see oil in the air tanks then that would be a good place to start. Could also be piston rings, valve guides/seals or the turbo. If you see oil in the coolant then that can indicate a bad engine oil cooler. Usually the exhaust aftertreatment will clean things up for a while but that would lead to damaging the particulate filter. Hope this helps. V 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/65693-mp7-disappearing-oil/#findComment-467983 Share on other sites More sharing options...
fjh Posted January 31, 2021 Share Posted January 31, 2021 Yup so true if its burning it you won't see it due to the dpf!( IF )you can get the Turbo off with out breaking studs ! You may see a wet Cyl on the exhaust ports by removing the manifold! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/65693-mp7-disappearing-oil/#findComment-468005 Share on other sites More sharing options...
mdrake67 Posted February 8, 2021 Author Share Posted February 8, 2021 On 1/30/2021 at 3:52 PM, Vmac3 said: Some oil consumption is normal between oil changes. How much oil is disappearing? From what it sounds like you have a part failure somewhere. If no visible leaks are found you could check the air compressor. If you see oil in the air tanks then that would be a good place to start. Could also be piston rings, valve guides/seals or the turbo. If you see oil in the coolant then that can indicate a bad engine oil cooler. Usually the exhaust aftertreatment will clean things up for a while but that would lead to damaging the particulate filter. Hope this helps. V So driving it for 3-4 hrs straight at hwy speed it will use about a gallon of oil, however if you drive it locally with lots of idle time you can run it all day and maybe lose a half a gallon Quote Link to comment https://www.bigmacktrucks.com/topic/65693-mp7-disappearing-oil/#findComment-468608 Share on other sites More sharing options...
fjh Posted February 8, 2021 Share Posted February 8, 2021 (edited) 55 minutes ago, mdrake67 said: So driving it for 3-4 hrs straight at hwy speed it will use about a gallon of oil, however if you drive it locally with lots of idle time you can run it all day and maybe lose a half a gallon If its burning it you will soon be forced to find out where its going ,as as mentioned the DPF will clog ,it should be doing frequent regens at this point! Soot level will go thru the roof and you will be parked! Just my opinion! Edited February 8, 2021 by fjh 1 Quote Link to comment https://www.bigmacktrucks.com/topic/65693-mp7-disappearing-oil/#findComment-468609 Share on other sites More sharing options...
Vmac3 Posted February 8, 2021 Share Posted February 8, 2021 Is the vehicle experiencing frequent regens as mentioned? One option for you to do is to remove the exhaust flex pipe under the cab and check the color of the exhaust. Snap the throttle and see if there is any indications of blue smoke. You may want to get to the bottom of this, as this will contaminate the exhaust aftertreatment system if its burning it. V 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/65693-mp7-disappearing-oil/#findComment-468617 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.