0w40 synthetic oil

Discussion in 'Small Block Tech' started by Mark Demko, Sep 23, 2019.

  1. Mark Demko

    Mark Demko Well-Known Member

    Was thinking of trying it.
    I just don’t understand how the oil can be a zero weight cold then a 40 weight hot??
    Or am I not getting ito_O
     
  2. Julian

    Julian Well-Known Member

    Well most race tires especially for road courses.. are not made out of rubber... I think on that
     
  3. UNDERDOG350

    UNDERDOG350 350 Buick purestock racer

    Thats what my RAM 2500HD with 6.4 calls for. Not the easiest to find. Not sure if there would be any noticeable gain. Just remember that oil is made for engines very different than our dinosaur engines.

    Not sure what tires have to do with this????
     
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  4. agetnt9

    agetnt9 Agetnt9 (Dan)

    I use 5w40 Gould for the cold starts and hold when warm...
     
  5. Mark Demko

    Mark Demko Well-Known Member

    I was theorizing the zero weight would be easier to start flowing cold and not have 90 lbs cold pressure when trying to accelerate SLOWLY until the oil warms, and the weight of 40 oil after it’s warm.
    Might just be my thinking is off LOL, I’ll just stay with 10/40 synthetic
     
  6. Jim Blackwood

    Jim Blackwood Well-Known Member

    I'm presently running 5w30 Mobil 1, considering going a bit thinner.

    Jim
     
  7. 87GN_70GS

    87GN_70GS Well-Known Member

    Lots of additives when the oil is being manufactured. Viscosity index improvers or modifiers. The drawback is VI modifers are more susceptible to shear
     
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  8. BQUICK

    BQUICK Gold Level Contributor

    Still only a ZERO weight oil. If you have super tight clearances maybe OK. But I'm more concerned with hot oil pressure. If you can still pull 80lb at 6000 rpm with it fine but I doubt it.
    Most of these thin oils are for fuel economy...not much protection hot...IMO
     
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  9. 2001ws6

    2001ws6 last of the v8 interceptors

  10. TrunkMonkey

    TrunkMonkey Well-Known Member

    0 weight oil does not exist until it is warmed up. [​IMG] I think it is made of Schrodinger's cat and Mermaid scales.
     
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  11. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Rule of thumb for any engine. Use the thinnest oil that gives you satisfactory oil pressure.
     
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  12. Mart

    Mart Gold level member

    Take those high volume gears out. You won't have 90 psi cold.....
     
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  13. Mark Demko

    Mark Demko Well-Known Member

    Im considering that:D
     
  14. Mark Demko

    Mark Demko Well-Known Member

    I see that all the time on the oil fill caps of late model turbo 4 cyl, 0w-20
    That oil has gotta be like mineral spirits hot:rolleyes:
     
  15. dan zepnick

    dan zepnick Well-Known Member

    My 14 GMC pickup with a 5.3 L calls for 0w20. When I change it I'm always thinking wow is that thin!! Comes out like water.
     
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  16. UNDERDOG350

    UNDERDOG350 350 Buick purestock racer

    Maybe just change the regulator spring to dump pressure at 60. 60 is more than enough pressure.
     
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  17. Jim Blackwood

    Jim Blackwood Well-Known Member

    Yeah, it's a bitch having too much oil pressure.
     
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  18. BQUICK

    BQUICK Gold Level Contributor

    Years ago Volvo was going to get a hefty fine for not meeting CAFE standards....so quick fix was specify 5W-30 oil vs 10W-30 on all models.

    Know someone with a Dodge that had 175K and used oil. I said switch from the 0W-20 to 10W-30 and I bet it would be barely burning any. They wouldn't do it and traded it in for next to nothing.....
     
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  19. stk3171

    stk3171 Well-Known Member

    I have always run 5-30 in my 350 Buick race motor but keep in mind that I run it real cold. I try to stage it at 110 where it runs the fastest. Most wear is caused from startup do to oil flow time though the oil passages restricting oil . Thinner oil gets to bearing faster and lubes better at cold temps. When qualify I use 0-20
    race oil .

    Im also running this in My 370 and 426 2009 Dodge Challenger.

    5-30 in daily drivers

    My 2018 Chevy truck 6.2 takes 0-20 .
     
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  20. gsgtx

    gsgtx Silver Level contributor

    the w stands for winter and not weight.
     

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