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Mechanics advice on 5.9 Dodge Magnum #4633476
01/13/18 10:25 AM
01/13/18 10:25 AM
Joined: Sep 2015
Posts: 882
California
mbacfp Offline OP
mbacfp  Offline OP
Joined: Sep 2015
Posts: 882
California
My trusted mechanic thought I should try running Castrol GTX 20w-50 instead of 10w-30 to see if that helps with some oil consumption first before assuming a plenum intake manifold gasket problem. I am thinking high mileage oil instead (10w 30). What do you all think? Thanks again for the advice and help.

Last edited by mbacfp; 01/13/18 10:28 AM.

2014 F-550 PSD..........M1 Delvac ESP 5w-40 + OEM
2018 Dodge Charger SRT Hellcat
2012 Toyota Sienna LTD 3.5L V6
2003 Dodge Durango R/T 4x4 5.9L V8
Re: Mechanics advice on 5.9 Dodge Magnum [Re: mbacfp] #4633493
01/13/18 10:36 AM
01/13/18 10:36 AM
Joined: Sep 2015
Posts: 6,071
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,071
Kalifornia Kollective
Gotta fix the issue. If it's sucking oil, grade won't do much ...


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Mechanics advice on 5.9 Dodge Magnum [Re: mbacfp] #4633494
01/13/18 10:37 AM
01/13/18 10:37 AM
Joined: Dec 2016
Posts: 7,099
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,099
Waco, TX
I think you should just fix the dang gasket already (after verifying if that is the problem)

Do you know what "troubleshooting" pertains to?

It sounds like you just want to change stuff....
....not find out what the REAL problem is.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Mechanics advice on 5.9 Dodge Magnum [Re: mbacfp] #4633501
01/13/18 10:39 AM
01/13/18 10:39 AM
Joined: Dec 2014
Posts: 1,684
'murica
Ethan1 Offline
Ethan1  Offline
Joined: Dec 2014
Posts: 1,684
'murica
Your trusted mechanic needs to diagnose things instead of using the method known to elementary school math teachers as "guess and check".

Re: Mechanics advice on 5.9 Dodge Magnum [Re: mbacfp] #4633506
01/13/18 10:43 AM
01/13/18 10:43 AM
Joined: Sep 2015
Posts: 882
California
mbacfp Offline OP
mbacfp  Offline OP
Joined: Sep 2015
Posts: 882
California
Yes, I am a little surprised as well. Maybe caught him on a bad day. Will order the Hughes Kit and be done with it. Thanks for the advice and time. Really appreciate it.


2014 F-550 PSD..........M1 Delvac ESP 5w-40 + OEM
2018 Dodge Charger SRT Hellcat
2012 Toyota Sienna LTD 3.5L V6
2003 Dodge Durango R/T 4x4 5.9L V8
Re: Mechanics advice on 5.9 Dodge Magnum [Re: mbacfp] #4633585
01/13/18 12:13 PM
01/13/18 12:13 PM
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,198
Campbellsville, KY
What grade does the engine spec, 5' or 10w30? Any mechanic that suggests running an oil that much thicker in a stock engine in an attempt at anything other than a short-term, stop-gap fix (even then it's a stretch) has some serious catching up to do.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Mechanics advice on 5.9 Dodge Magnum [Re: Alex_V] #4633594
01/13/18 12:20 PM
01/13/18 12:20 PM
Joined: Jan 2008
Posts: 10,955
OH
SatinSilver Offline
SatinSilver  Offline
Joined: Jan 2008
Posts: 10,955
OH
Originally Posted By: mbacfp
2003 Dodge Durango 5.9...94,500 miles. Concerned about oil consumption. 1.5 quarts every 3,000 miles or so. Using Pennzoil Platinum 10w-30, yearly OCI. Should I try a high mileage 10w-30 or go straight to a 5w-40. No smoke, leaks, etc. Interested in combating oil consumption. Any advice on this motor.


^ From another thread. Sometimes with that oil it takes a few intervals for the consumption to level off. Same thing with Pennzoil Ultra. Just keep using it and see if the consumption gets better. And below from 1/8/18:

Originally Posted By: mbacfp
Not convinced it is Plenum...probably going to fix with Hughes Kit anyway. Curious what High Mileage oils were good to start using going forward. Thanks and I promise no more threads on this issue.


Originally Posted By: mbacfp
Thanks BrocLuno. I apologize to all for so many similar threads. Will not happen again.


Re: Mechanics advice on 5.9 Dodge Magnum [Re: mbacfp] #4633616
01/13/18 12:47 PM
01/13/18 12:47 PM
Joined: Sep 2015
Posts: 882
California
mbacfp Offline OP
mbacfp  Offline OP
Joined: Sep 2015
Posts: 882
California
Thanks to all. Been hard to diagnose without removing parts. Looked down throttle body and their is some dark discoloration, but no puddles of oil. I have no other symptoms of Plenum other than oil consumption. Car sat for a week and absolutely no smoke at start up or rough ideling, etc. Changed PCV with OEM. I apologize if I have annoyed anyone with my circular oil consumption posts. I have decided to do Plenum and hope that is it. Thanks for putting up with posts.


2014 F-550 PSD..........M1 Delvac ESP 5w-40 + OEM
2018 Dodge Charger SRT Hellcat
2012 Toyota Sienna LTD 3.5L V6
2003 Dodge Durango R/T 4x4 5.9L V8
Re: Mechanics advice on 5.9 Dodge Magnum [Re: mbacfp] #4633698
01/13/18 02:14 PM
01/13/18 02:14 PM
Joined: Dec 2016
Posts: 7,099
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,099
Waco, TX
Originally Posted By: mbacfp
I apologize if I have annoyed anyone with my circular oil consumption posts. I have decided to do Plenum and hope that is it. Thanks for putting up with posts.


No problem...

We are just trying to keep you from "Loading up the parts shotgun" and blasting away (hoping any number of them fixes the problem.

I would diagnose it first before ordering anything.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Mechanics advice on 5.9 Dodge Magnum [Re: mbacfp] #4633745
01/13/18 03:01 PM
01/13/18 03:01 PM
Joined: Sep 2015
Posts: 882
California
mbacfp Offline OP
mbacfp  Offline OP
Joined: Sep 2015
Posts: 882
California
I appreciate it. I am going to have it looked into for sure before throwing uneeded money into it. Probably a little over my head in taking throttle body and intake manifold out to diagnose. I will update everyone on what I find. Appreciate everyone's help and patience.


2014 F-550 PSD..........M1 Delvac ESP 5w-40 + OEM
2018 Dodge Charger SRT Hellcat
2012 Toyota Sienna LTD 3.5L V6
2003 Dodge Durango R/T 4x4 5.9L V8
Re: Mechanics advice on 5.9 Dodge Magnum [Re: mbacfp] #4633748
01/13/18 03:03 PM
01/13/18 03:03 PM
Joined: Jan 2011
Posts: 2,820
N.Ohio
Lubener Offline
Lubener  Offline
Joined: Jan 2011
Posts: 2,820
N.Ohio
You need a new mechanic.


The "thinking" man's friend.

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