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Freshly rebuilt engine - Oil light on!

Discussion in 'Bay Tech Clinic' started by Chidori, Oct 10, 2016.

  1. syncro

    syncro Well-Known Member

    Messages:
    8,968
    Location:
    Southern Highlands
    Information that I have been given from lubrication engineers that I used to work with. Fully synthetic oils do not transfer heat as well as mineral oils, so your oil temperature will be lower. This means that the oil is not cooling the engine as well as it should. In industry they do not use synthetic oils for cooling applications. eg. large transformers

    This is not my opinion, but what I was told by guys that went to university to learn about oils and greases.

    (They also told me not to steal the very expensive molybdenum disulphide grease from work for my CVs as it would dry out because it wouldn't be worked hard enough)
     
  2. cbus

    cbus Well-Known Member

    Messages:
    10,842
    Location:
    sunshine coast
    I think they were telling porkies to protect their stocks.:D
     
    chris taylor likes this.
  3. chris taylor

    chris taylor Well-Known Member

    Messages:
    1,544
    Location:
    adelaide sth aust
    Ok, well dont seem to be any further ahead at this point, mmmmmm, none for , none against.......
     
  4. Gordon D

    Gordon D Active Member

    Messages:
    249
    Location:
    Brisbane
    Hi guys, hopefully this is within topic but a colleague who has rebuilt other motors (not VWs) suggested that the first oil after the rebuild should be lighter (like a 10W-50) to get a good flow around the block, get everything lubricated, run a few 100k's gently for the run in and lubrication and then drop that oil (as you would anyway) for the post run-in oil change. Has anyone done that ... or think it would be worth doing ... on a 1.8/2l Type 4 motor?
     
  5. Chidori

    Chidori Active Member

    Messages:
    885
    Location:
    Fitzroy, VIC
    I ran 'break in' oil on my engine (the one discussed in this thread.
    Did not make a difference in oil pressure. The issue seems to have been related to case / bearing clearance, as once the case was replaced, the problem was gone.
    At a guess, I think the problem was with the machine shop. I reckon that the engine builder took for granted that the machine shop's measurements were accurate and slapped it all together without checking clearances.
     
    oldman and Barry like this.
  6. oldman

    oldman Super Moderator Staff Member

    Messages:
    7,994
    Location:
    Avalon Beach NSW
    .......yup, there’s more to rebuilding an engine than just assembling parts....
    Cheers,
    Mark
     
    Wayne murray, Mordred and Chidori like this.

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