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Ls1 excessive oil consumption?

Discussion in 'LSx Development and Modification' started by vr304, Oct 27, 2014.

  1. vr304

    vr304 Well-Known Member

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    Hi guys I have a 2001 vx ss 6 speed manual with 116,000 ks on the clock and it seems to be chewing thru the oil, any ideas what could be causing it?
     
  2. Grennan

    Grennan Slayer of Stupid Threads

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    Its not uncommon for LS1s, especially the earlier ones to consume a lot of oil.

    Is it blowing smoke? Piston rings worn and its burning oil perhaps. Have you got a catch can - could be a lot of blowby in the manifold. Noticed any leaks? Checked the rear main seal? These are fairly common to go as well.
     
  3. commodore665

    commodore665 expat Saffa

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    as above it was a common problem with the LS1 engine to use oil , even from new they were oil eaters , as Grennan says check the obvious things first .
     
  4. corhijasna

    corhijasna Member

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    first thing to do as mentioned before is to check for oil leaks,if none are found then run the car for a while and remove oil cap and check for plumes of smoke then check exhaust for a bluey coloured smoke,if these are ok then you probably have the wrong grade of oil in the car,10-30 or 10 40 is what you should use at a minimum imo
     
  5. vr304

    vr304 Well-Known Member

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    Remove oil cap with engine still running? If I do see plumes of smoke what does that indicate? I am running Penrite hpr 10 oil so shouldn't be the problem
     
  6. Grennan

    Grennan Slayer of Stupid Threads

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    Will let you know if oil is burning.

    If it is burning, it means theres an issue with your piston rings. Thicker oil MIGHT help slow it down but its a temporary band aid.

    As I said, even new, they were oil guzzlers. A lot were replaced under warranty.
     
  7. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    More of a problem too with the manual cars if the drivers like to use the gears to brake the car which of course is normal with a manual box.
     
  8. vr304

    vr304 Well-Known Member

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    So if I gave it a compression test what sort of numbers should I be seeing?
     
  9. Drewie

    Drewie Active Member

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    Just had a look in my LS1 workshop manual and all it says is:
    Minimum compression reading should be not less than 690 kpa.
    Variation between cylinders: The lowest reading should be not less than 70% of the highest reading.
     
  10. gmwarrior

    gmwarrior New Member

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    Hey mate just wondering, why is that more blow by being created when engine breaking??
     
  11. Grennan

    Grennan Slayer of Stupid Threads

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    Blow by is heightened (but not caused) by high rev driving/where the engine makes a lot of its torque

    When you engine brake youre typically in the mid to high rev range for a period of time.
     
  12. EYY

    EYY Well-Known Member

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    It might have a lot to do with the extremely high manifold vacuum when engine breaking too. Possibly oil through the pcv?
     
  13. Grennan

    Grennan Slayer of Stupid Threads

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    The PCV is where a lot of it comes from.

    Seeing how much oil was being captured once i install a catch can was a little scary.

    That being said, if the OP is talking about "hey im missing a litre of oil" I wouldnt think it would be blow by and would think it would be comming from somewhere else.

    Typically I was collecting maybe 100-200ml of oil every 5000km, but mine was getting on in age at that point.
     
  14. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    I read a technical bulletin a few years back (can't remember if it was from Holden or GM?), basically put is said a lot of the issues with the oil burning issues was to do with the type of rings used in the LS motors. GM decided to use rings with slightly less tension to reduce friction and improve efficiency. My understanding is the fix for oil burning LS engines fixed under warranty was to use standard tension rings on the rebuild.

    Now the issue with the manual cars is that they tend to see medium to high revs with a fully closed throttle which leads to a very high vacuum in the cylinders, coupled with low tension rings that haven't seated properly and you have a good recipe for getting oil into the cylinders and going out the exhaust.

    http://www.rjsmith.com/gm-894549.html
     
    Last edited: Oct 29, 2014
  15. vr304

    vr304 Well-Known Member

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    Hmmmmm not really that keen on forking out for a rebuild might try installing a catch can setup see if that helps my situation
     
  16. DLFHUB666

    DLFHUB666 GIT 'EERRR DONE!!!

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    All a catch can will do is catch the oil it wont stop it getting past the rings.
     
  17. Towcar

    Towcar Well-Known Member

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    Thread dig, but did you fit the catch can? How much was being recovered?

    I am loosing around a litre every 5000km and have been thinking about a catch can, if you got one did you rout it to drain back into the sump?
     
  18. st3r3otyp3

    st3r3otyp3 Donating Member

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    Get a LS6 PCV set up it has a OIL/AIR separator box that stops the oil from leaving the system, I installed one and it works perfectly.

    LS1Howto.com

    [​IMG]

    after fitting take the throttle body off and clean it all with Carby/TB cleaner and use 2 cans threebond engine conditioner afterwards. it will stay clean after that.

    One other thing is on our LS1 it has a the other rocker cover breather, this can be joined to the LS6 set up using a 7.9mm Y piece, before or after the valve.

    [​IMG][/URL][/IMG]

    the Y piece.

    Brass Y Piece Fitting 5 16" Hose Barb Enz P75 05 | eBay

    I purchased from here, and if you ask him he will bundle the $8 corvette plug for old hole on the passenger side as described in the how to with no xtra postage. as the postage was like $50 for it lol., cut and reused the old valve and used 5/16 fuel hose so all up it was about $130 odd, I also had that notch in the block that needs to be cut to accommodate the new set up.

    LS6 PCV.
    LS1 LS6 Engine Valley Cover Corvette 04 06 GTO cts V Built in PCV Valve 12577927 | eBay

    Corvette plug.
    LS1 LS6 Valve Cover PCV Grommet Plug 12568011 | eBay.
     
  19. Towcar

    Towcar Well-Known Member

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    Thanks for that, not keen on having to notch the block, I'd sooner look for catch can option but the information above is really good.
     
  20. st3r3otyp3

    st3r3otyp3 Donating Member

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    No probs, I was a bit stressed about it (notch) at the time, but if you take your time, and use the right tools, its golden.
     

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