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TDI oil temp question

Discussion in 'A3/S3/Sportback (8P Chassis)' started by sleep envy, Mar 1, 2008.

  1. sleep envy
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    sleep envy Member

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    [Mar 1, 2008]
    on the back of this thread

    http://www.audi-sport.net/vb/showthread.php?t=41310

    it's mentioned that the DIS has an oil temp gauge

    unfortunately my car doesn't have it so I'm constantly guessing at the oil temp when driving the car when cold

    could anyone be kind enough to give me some indication as to how long it roughly takes for the oil to get up to temp when the water reaches normal operating temp of 90 degrees
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  3. newbiecrg
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    newbiecrg windsurfer

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    [Mar 1, 2008]
    that is an interesting question....

    I would assume that oil reaches temperature much faster than the water that cools the engine... I mean that for the water reach 90, the oil has to be there before.... but really don;t have a clue...

    Pedro
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  4. sleep envy
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    sleep envy Member

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    [Mar 1, 2008]
    I *think* the water gets up to temp before the oil as most engines have a thermostat which stays closed until it's at normal temp - it also helps to warm up the matrix on cold, winter mornings

    not sure there's a thermostat for the oil system

    it's a PITA as my commute is mostly A road so I have to drive at a slow pace until I'm definite the oil is up to temp
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  5. newbiecrg
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    newbiecrg windsurfer

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    [Mar 1, 2008]
    off course there is a thermostat but for the water to warm up there has to be a heat transfer... which will be from the hottest part to the coldest... so I was assuming that the oil had to warm up before the water...

    Pedro
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  6. sleep envy
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    sleep envy Member

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    [Mar 1, 2008]
    possibly...

    DIS temp readout will answer this :)
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  7. newbiecrg
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    newbiecrg windsurfer

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    [Mar 1, 2008]
    but there is also the heat generated by the combustion it self so the oil might not warm up before the water!! I said it was an interesting question.... lolol
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  8. newbiecrg
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    newbiecrg windsurfer

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    [Mar 1, 2008]
    I guess tomorrow I will let you know.... will drive my S3 and see which temp gets sorted first.

    Water temperature is lower than oil temperature... I think in my S3 normal oil temp is around 95-97

    Pedro
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  9. sleep envy
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    sleep envy Member

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    [Mar 1, 2008]
    cheers but a weasle takes far longer to get up to temp as it's a far more efficient engine than a petrol burner - need confirmation from a TDI driver

    as an aside - what temps do you get on the motorway?
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  10. newbiecrg
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    newbiecrg windsurfer

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    [Mar 1, 2008]
    got oil temps of 105 sometimes but motorway pushing hard 100.... pretty stable the oil temp

    Pedro
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  11. newbiecrg
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    newbiecrg windsurfer

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    [Mar 1, 2008]
    also the water temperature is not accurate! the dial is not accurate its positions are average... I would like to have real time water temp on the DIS as well...
    #10
  12. sleep envy
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    sleep envy Member

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    [Mar 1, 2008]
    maybe the DIS could be modified to include it??

    :think:
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  13. sleep envy
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    sleep envy Member

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    [Mar 1, 2008]
    can the old skool DIS be modified to show both temps??
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  14. newbiecrg
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    newbiecrg windsurfer

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    [Mar 1, 2008]
    don't know but if it was something interesting I could use my go kart datalogger and get all the tempreatures that I wanted, even exhaust gas temps! (important in go karts to know what is happening in the combustion chamber...)

    But that would require some wiring and can'te really be bothered...lolol Let's hope someone in the forum either with VAG-COM or not give us an hint!

    Pedro
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  15. Matt
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    Matt Active Member

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    [Mar 2, 2008]
    The oil takes a lot longer to get up to temp than the water. Water will be showing 90 and oil will still only be showing as 50ish.

    It takes about 10 miles for my oil to get to 80 degrees. Highest I've seen it is 89 degrees after pushing it a bit and then it cooled down to 82 which is generally where it sits once its warmed up.
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  16. lil_coz
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    lil_coz Active Member

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    [Mar 2, 2008]
    Matt's right.

    Oil takes a lot longer to warm up. Once my water temp gets to 90, my oil is at 55ish. I do a lot of motorway mileage and the oil when warmed up to it normal temp reads between 87~89 degrees. Havent really timed how long it takes to get there tho.

    Coss
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  17. newbiecrg
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    newbiecrg windsurfer

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    [Mar 2, 2008]
    found the same today... oil takes longer...

    I guess one must be carefull and wait a little bit more even if water temp is at 90C as oil temp not yet right and oil not working 100%...

    Lesson learned... will be even more careful before giving the S3 the beans...

    Pedro
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  18. Teejay
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    Teejay Mellow Yellow

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    [Mar 2, 2008]
    If you buy the expensive long-life oil it will work to some extent from the moment you turn the key and will have achieved most of it's required properties by the time it reaches 50 degrees - so probably about the same time the water guage shows 90.

    Incidentally has anybody ever been in a VW that was healthy and not been at 90 degrees when warmed up? I've had a Seat Ibiza (first VAG version), Mk2 Golf GTi, Mk3 Golf TDi, 8P A3 TDi which have all sat bang on 90. My dad is like a stick of VW rock - apart from his first car - a Mini, he's only ever owned VW's. Beetle (old school), Mk1 Golf, Mk2 Golf, Mk2 Golf GTi, Passat GT (the last Passat which looked good), Mk4 Golf TDi, Passat TDi, Mk1 Bora TDi and now has a Touran TDi - all of which have all sat at 90 degrees (or so he tells me).
    #17
  19. newbiecrg
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    newbiecrg windsurfer

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    [Mar 2, 2008]
    I think the water temp needle is not actually indicating real temperature... it stays at 90 mark for a temperature range... what I mean is that it will stay at 90 if temp is 85 or 95...

    I read this somewhere... but I might be wrong...

    Pedro
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  20. Gti Jazz Blue
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    Gti Jazz Blue Active Member VCDS Map User

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    [Mar 3, 2008]
    Yes it will remain on the 90 spot once up to temp and only go outside of it when the temp is outside the normal range.

    Not sure what that range is but basically there is a window of temp where it will sit at 90. Personally I'd prefer to see it fluctuate with the temp.

    Paul
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  21. simon-s3
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    simon-s3 Member

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    [Mar 3, 2008]
    I find it takes between 15 and 20 mins to get the oil up to 90 degrees.
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  22. newbiecrg
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    newbiecrg windsurfer

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    [Mar 3, 2008]
    Anyone knows what is the optimum temperature for the oil? I understand that is different from the water temperature on the radiator...
    #21
  23. sleep envy
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    sleep envy Member

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    [Mar 11, 2008]
    cheers chaps - will need to take the long way onto the A1M before I give it some welly

    don't know what the exact figures are but oil has a range depending on the type of driving you are doing

    on motorways the engine will run far cooler than sitting in traffic or a slow 2nd gear crawl up a mountain on a hot day

    have seen a 25% difference in temp on my air cooled flat six which has a mega accurate guage (for obvious reasons)
    #22

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