• Welcome to SVTPerformance!

Another oil consumption thread

Discussion in '2015+ Shelby GT350 Mustang' started by usaf_branham, Oct 14, 2018.

  1. jvandy50

    jvandy50 Active Member Established Member

    Messages:
    370
    Joined:
    Sep 22, 2015
    Location:
    AR
    I sure hope you’re under the 500mi/qt threshold or you’ll be repeating that test, which means another 1k miles before your car is right. Good luck man!
     
  2. COOL COBRA

    COOL COBRA Hell Yes! Premium Member Established Member

    Messages:
    2,957
    Joined:
    Nov 23, 2012
    Location:
    Southern Mo.
    We've heard this so many times. Makes me wonder if the new GT500 (if it's ever built) will share the problem.
    I'd be hating life if a new car was burning that much oil. Not rubbing it in, just sayin.
     
  3. usaf_branham

    usaf_branham Member Established Member

    Messages:
    66
    Joined:
    Feb 17, 2013
    Location:
    Vegas!
    Update: I put 700ish miles on the car and took it back to the dealer this morning. They pulled the dip stick and it was bone dry. Burned around 2 or 3 quarts I guess... needless to say, I’m getting a new motor next week.
     
  4. gimmie11s

    gimmie11s Handlebar mustaches... PSSHHH! Established Member Established Member

    Messages:
    9,238
    Joined:
    Jun 1, 2004
    Location:
    so cal

    Holy crap. Sorry to hear man. That’s awful!


    Sent from my iPhone using the svtperformance.com mobile app
     
  5. biminiLX

    biminiLX never stock Established Member

    Messages:
    9,682
    Joined:
    Jan 17, 2003
    Location:
    Toledo, OH
    Seems like some updates have helped this. Maybe the next version of the 5.2 block shared with 350/500 has helped? Maybe a ring, hone or piston update? Either way it seems most recent builds less effected. Glad Ford is taking care of you
    -J
     
  6. 1FASFKR

    1FASFKR Active Member Established Member

    Messages:
    406
    Joined:
    Jun 15, 2013
    Location:
    Texas
    Agreed. Just for clarification...because I don't see it posted in this thread...I see the OP bought a 17 Avalanche Grey GT350 CPO with 5k miles on it.
     
  7. scottGT500

    scottGT500 Active Member Established Member

    Messages:
    1,211
    Joined:
    Jul 15, 2009
    Location:
    Olive Branch, MS
    Is this problem for all years? I am about to take delivery of an ‘18 R...not sure if the problem has been resolved on the newer gt350’s.

    Scott
     
  8. 07 Black Beauty

    07 Black Beauty Well-Known Member Established Member

    Messages:
    2,075
    Joined:
    Jan 30, 2011
    Location:
    Florida
    I have a 18R that I daily with no consumption issues @6,000. I think proper break helps
     
  9. scottGT500

    scottGT500 Active Member Established Member

    Messages:
    1,211
    Joined:
    Jul 15, 2009
    Location:
    Olive Branch, MS
    How did you break yours in? Mine will have @100 miles on it when it arrives...
     
  10. 07 Black Beauty

    07 Black Beauty Well-Known Member Established Member

    Messages:
    2,075
    Joined:
    Jan 30, 2011
    Location:
    Florida
    Kept it under 4k RPM's for the first 1k miles then changed the oil.
     
    1FASFKR and scottGT500 like this.
  11. WVTrakPak

    WVTrakPak Active Member Established Member

    Messages:
    294
    Joined:
    Sep 22, 2014
    Location:
    WV
    Hit 8250 at 101 miles and did not hold extended rpms until after 1000 miles. Sees the redline everytime it goes out. 1600 miles and first track day next week with zero oil used.
     
  12. gimmie11s

    gimmie11s Handlebar mustaches... PSSHHH! Established Member Established Member

    Messages:
    9,238
    Joined:
    Jun 1, 2004
    Location:
    so cal
    This is proper break in.
     
    5.2Leader likes this.
  13. 1FASFKR

    1FASFKR Active Member Established Member

    Messages:
    406
    Joined:
    Jun 15, 2013
    Location:
    Texas
    I broke my R in the same way as 07 Black Beauty. Followed the recommended procedure as best I could. There are varying opinions in it. WVTrakPak did it differently. WVTrakPak has zero oil usage. 2300 miles on mine doing it my way and zero oil usage. One thing is for sure tho. I would sift thru the BS of those that actually have a Voodoo motor and those that don't but offer up there "expertise" like they know a shit or two about it. At the end of the day, it's your car. Live with the decision how ever it turns out.
     
  14. gimmie11s

    gimmie11s Handlebar mustaches... PSSHHH! Established Member Established Member

    Messages:
    9,238
    Joined:
    Jun 1, 2004
    Location:
    so cal
    Ah hahahahahahahahahahahaha!

    um.gif
     
  15. ANGREY

    ANGREY Active Member Established Member

    Messages:
    416
    Joined:
    Oct 24, 2017
    Guys, let's be honest. There's enough varying data out there to suggest that it's still random and/or unidentifiable.

    You should break in your engine properly, regardless of the oil consumption issue, just because it helps to prevent other issues. But the reality is, you could break the motor in properly and still burn oil. You could break the motor in properly and it burn oil soon after or long after.

    You could drive it off the lot like you stole it and it not burn oil, or burn oil right away.

    I happen to think the issue has more to do with cold start up and not letting the motor warm to operating temperature.

    This is one of the FEW vehicles I've ever owned where I don't just jump in and go. I let it warm past idle drop (120F coolant temps) and even then, I limp it around until it's all the way up to steady state before I flog it. I'm convinced that when the aluminum pistons are cold, they shrink and the rings don't seat properly (or as well as they would otherwise) and that's one (of possibly many) issues surrounding oil burning.

    I also think windage through the PCV valve is another. Extending high rpm suspends the oil and we see it in our catch cans.

    But as I've pointed out numerous times, the oil isn't leaking (otherwise SOMEONE would observe leaks, oil in the back of the car, etc) and it isn't going into the coolant (otherwise tons of people would have reported it.). It's either going through the PCV valve and burned through the motor and out the exhaust, OR it's blowing by the rings and out the exhaust OR it's the valve seats and guides and being burned off. But it's definitely being burned and sent through the exhaust. It might be a combination of suspended windage, ring blow by or valve seat/guides leaking.
     
    DeathvalleySC and 1FASFKR like this.
  16. gimmie11s

    gimmie11s Handlebar mustaches... PSSHHH! Established Member Established Member

    Messages:
    9,238
    Joined:
    Jun 1, 2004
    Location:
    so cal
    Agree!

    Rings are steel and operate completely independent of the piston as it pertains to heating/cooling and expansion.
     
  17. 1FASFKR

    1FASFKR Active Member Established Member

    Messages:
    406
    Joined:
    Jun 15, 2013
    Location:
    Texas
    Agreed. My personal opinion is you should never put a load on cold motor. I think there's a greater chance you'll get blow by doing that with the pistons not fully expanded. With 10 quarts of oil in the res, that's a lot of cold oil to pump thru before it gets warm. I personally leave the garage at about 130 degrees and stay between 2500-3000 rpm until it gets warmed to 181 degrees then I'll start driving it normally where my normal shift points are about 3700- 4000 rpm. It's game on in the 190 temps.
     
    DeathvalleySC likes this.
  18. 03reptile

    03reptile Active Member Established Member

    Messages:
    677
    Joined:
    Jun 7, 2003
    Location:
    Gaithersburg, Maryland
    I agree with your assessment; however, if the oil is being passed by the rings into the exhaust cycle, why wouldn't the owners see some smoke out of the exhaust? If you sit at a light, idling, and then move forward with an accompanying puff of smoke, that usually means worn valve guide seals..right? I'm not hearing anyone saying their GT350's are smoking. Weird. Maybe not enough oil is going through to be visually apparent, but it's still using enough to see it on the dip stick? I've got a 2019 GT350 ordered and waiting for delivery. Hope Ford has addressed this issue so I don't join the oil club!
     
    DeathvalleySC likes this.
  19. ANGREY

    ANGREY Active Member Established Member

    Messages:
    416
    Joined:
    Oct 24, 2017
    Agreed, but if the piston isn't fully swollen in the cylinder, wouldn't that effect the geometry of the ring against the cylinder wall if it slaps? If one part of the piston skirt is slapping that means the angle of the piston is not perfectly parallel to the bore. That means one side of the head is low and one side is high of perpendicular. I'm imagining even small changes in not having the piston perfectly aligned in the bore is going to create challenges for the rings to seat properly (or as it's worn to mate under steady state conditions).

    I'm by no means convinced I'm right here, I'm just throwing out ideas. I wouldn't think a piston that's old and worn (or a bore that's hogged out) is gonna burn oil regardless of how new the rings are just because the geometry of the ring is changing constantly.
     
    DeathvalleySC likes this.
  20. gimmie11s

    gimmie11s Handlebar mustaches... PSSHHH! Established Member Established Member

    Messages:
    9,238
    Joined:
    Jun 1, 2004
    Location:
    so cal
    Its a good discussion and important to try and figure this stuff out.

    In theory, that makes sense. Question is do you ever hear piston slap? Ive not heard any 350 owners reporting that problem.

    Also, the amount of swelling the piston would have to experience to make this logical would be so much, you could actually see the difference in piston size cold vs. warm. That in and of itelf would present a ton of other issues. Even a motor with cold start piston slap is going to have a piston damn near perfectly perpendicular to the combustion chamber once it reaches TDC.

    To test the theory, we can look to an engine design with known piston slap issues; the early Chevy LS motors. Wife's 6.0 suburban slaps every morning for a minute or two as it warms up. This motor has 192k miles and uses about 1/2 quart of 5w30 between 5000 mile oil changes which is basically nothing. In all likelihood that 1/2 quart is due to valve guide wear more so than ring wear.
     
    DeathvalleySC likes this.

Share This Page