1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

heavy oil stabiliser

Discussion in 'Performance' started by kombi 74, May 10, 2021.

  1. kombi 74

    kombi 74 New Member

    Messages:
    3
    Location:
    denmark wa
    What are the pros and cons of using heavy oil stabiliser additive in a 74 kombi motor? Can the increased oil pressure create problems in an old motor?
     
  2. cbus

    cbus Well-Known Member

    Messages:
    13,362
    Location:
    sunshine coast
    I have compared 25/70 and 20/60 in 1800 engine .
    Miles uncertain but no noises and running normal pressures on the 20/60.
    The 25/70 ran hotter in Qld summer conditions.
    From memory about 10 degrees C
    Reversal reduced temps.
    Our engines rely significantly on oil flow for cooling.

    I am sus re thickeners.
    I would do an oil pressure test, hot, before trying heavier grade oils .
    If bearings require something heavy then engine is getting near terminal in my view.

    Why the consideration of thick additive?
     
  3. kombi 74

    kombi 74 New Member

    Messages:
    3
    Location:
    denmark wa
    Product's claim for better lubrication on cold start up (mine only gets a run every week or so), quieter running, less leaks.
     
  4. cbus

    cbus Well-Known Member

    Messages:
    13,362
    Location:
    sunshine coast
    Claims are so much hot air in most cases.
    I can't give much evidence either way .
    Some people love additives such as Lucas and Morey's.
    My view is based on trusting oil chemistries by people with the requisite skills and test evidence.
    A mechanic I worked with said the best thing about oil thickeners ( the goopy ones) is that they usualy didn't mix with the oil. ie, no effect.
    I don't trust U tube , but the gear illustrations indicate more foaming with Lucas or Morey's in gearbox situations.
    Bubbles in oil = non lubrication.

    I have used pro-ma with observed success for hydraulic lifters.
    Seal swelling additives, same.
    An old friend who had a dealership way back trusted moly bond.

    Oil thickeners I wouldn't touch.
    Non leaking engine you could try nulon.
    Worn, I use pro-ma sometimes.

    For your description I would maybe use penrite vw blend.
    Supposedly clings better between runs??
    Possibly consider nulon or pro-Mar.

    Mostly a punt without valid scientific tests.

    I should add..
    A mate had an old Chrysler changer with VERY noisy diff..
    3 bottles ( 250 ml??) of STP and 500km and it shut up.
    Was amazed.
    But I wouldn't transpose that to a VW engine.
     
    Last edited: May 10, 2021
    Wayne murray and Barry like this.
  5. kombi 74

    kombi 74 New Member

    Messages:
    3
    Location:
    denmark wa
    Thanks for your input. I might try penrite vw blend, if I can find it.
     
  6. Wiz

    Wiz Active Member

    Messages:
    235
    Location:
    Near Ballarat
    I've just peeled a banana if you want to quieten the diff noise.
    upload_2021-5-10_14-44-42.png
    PR
     
    Wattie and David H like this.
  7. rstucke

    rstucke Well-Known Member

    Messages:
    1,731
    Location:
    Wamberal NSW AUS
    if you've got low oil pressure at idle use Penrite 10/60 (motor cycle oil)
    if it's really bad use Penrite Harley Davidson oil (20/60) V Twin
    both are for Hi temp (think about a Harley, they're a heat trap) flat tapit extra zinc oil
    if that don't work your engine is on borrowed time
     
    Last edited: May 11, 2021
    David H and cbus like this.

Share This Page