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NP203 oil

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Jonathan, Sep 27, 2001.

  1. Jonathan

    Jonathan 1/2 ton status

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    I'm going to change all my fluids this weekend and was wandering which oil to use in my NP203, everything I've seen here says to use exactly what I use in the motor, but the guy at the parts store says to use nondetergent 30 weight to keep the chain from streching. What do ya'll think? Also what should I use in my axles?

    77 Blazer, 350, NP203, K&N, 31-inch Cooper Discoverers
    <a target="_blank" href=http://community.webshots.com/user/jonathandwill>http://community.webshots.com/user/jonathandwill</a>
     
  2. chevyfumes

    chevyfumes Court jester

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    Watch for the muzzleflash!
    I don't think that sounds right...

    <font color=blue> I'd rather have a bottle in front of me, than a frontal lobotomy!
     
  3. Executioner

    Executioner 1/2 ton status

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    I think you should go back to that guy at the parts store and get an explanation.
    Use motor oil in the NP 203, use whatever you have on hand .
    Use gear oil in the diff's, if your in the desert southwest use 80/90W-140, anywhere else use 80/90W.
    Good luck
     
  4. ChevyCaGal

    ChevyCaGal 3/4 ton status

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    The Haynes manual recommends: NP203 10w-30 engine oil

    <a target="_blank" href=http://www.chevycagal.homestead.com/steph.html>Steph's Webpage</a>
    Suck Fumes Ford Boy
    &lt;&gt;&lt; PSALMS 23 &gt;&lt;&gt;
     
  5. Jonathan

    Jonathan 1/2 ton status

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    He said something about the detergent in regular motor oil would make the chain stretch easier.

    77 Blazer, 350, NP203, K&N, 31-inch Cooper Discoverers
    <a target="_blank" href=http://community.webshots.com/user/jonathandwill>http://community.webshots.com/user/jonathandwill</a>
     
  6. RedDwarf

    RedDwarf 1/2 ton status

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    Non detergent is specified for all non-engine type stuff.
    Worm gear winches and spur gear winches(Warn8274)
    specify non-detergent.

    It's not hard to find, the 99c crap at Family Dollar is often non-detergent.

    You do not need 75w gear oil in a chaindrive case. 10w-30 will work if you can't find straight 30.

    Poundin' the ol "pavment"!
     
  7. DesertDueler

    DesertDueler 1/2 ton status

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    What about the NP208? Is there anything special I should use?

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  8. RedDwarf

    RedDwarf 1/2 ton status

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    Yup. It takes ATF

    You already knew that right?

    Poundin' the ol "pavment"!
     
  9. DesertDueler

    DesertDueler 1/2 ton status

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    Yea, I just wasnt sure if there was anything else out there that works better.

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  10. RedDwarf

    RedDwarf 1/2 ton status

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    Well, how about synthetic ATF?
    Runs cooler, amybe even quieter(NP 208 sure is noisy in LOW aint it?)

    Poundin' the ol "pavment"!
     
  11. Pugsley

    Pugsley 1/2 ton status

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    Next time I change mine I'm gonna put in FA instead of Dexron and see how it does - being a little thicker, I'd think it'd work better - atleast down here in the land of heat.

    Special thanks to those lost from IAFF Locals 94 and 854 - You shall never be forgotten
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  12. Jonathan

    Jonathan 1/2 ton status

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    So, I should use straight 30 weight

    77 Blazer, 350, NP203, K&N, 31-inch Cooper Discoverers
    <a target="_blank" href=http://community.webshots.com/user/jonathandwill>http://community.webshots.com/user/jonathandwill</a>
     
  13. Executioner

    Executioner 1/2 ton status

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    I hear you, make sure you don't take a bath with that parts guy ! I really don't think it will make a difference
    for a NP 203, and say 200K miles, at say an average oil drain/refill of every couple of years . A clean chain
    should not streacht, but if the oil breaks down, and fills the chain up with gunk, what would happen ?
    Really just use whatever you have, or buy whatever is on sale/cheap.
    Good luck
     
  14. RedDwarf

    RedDwarf 1/2 ton status

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    Get the non detergent, you can use 10-30, 10-40, or straight 30.

    You don't need the detergent because you don't have contamination of the oil, so it will only cost you lubrication.

    I don't think the detergnet will hurt the chain though as they are similar to a timing chain and it obviously doesn't hurt them....

    Poundin' the ol "pavment"!
     
  15. dragricinMT

    dragricinMT 1/2 ton status

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    10-30 motor oil. 99% is detergent oil. I run valvoline in everyything. Get part #129 valvoline.

    78-K5 4"Lift 35"Tires 400SB TH350 NP205
    73 Vega 350SB TH350
     
  16. mike reeh

    mike reeh 1/2 ton status

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    hmmm... mobil 1 in the NP203!! theres a thought.

    mike
     
  17. RedDwarf

    RedDwarf 1/2 ton status

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    Why the heck not?

    Should last forever.
    Unfortunately, it will probably make the NP 203 last forever too...

    Still Poundin' "pavment" after 275 Posts!!!
     

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