what type of oil

Discussion in 'General Chevy & GM Tech Questions' started by cucu-z71, May 17, 2010.

  1. cucu-z71

    cucu-z71 New Member

    I have a 2000 gmc with the 5.3

    i use penzoil but should i u se 5w-30 or 10w-30?
  2. j-schmizzle

    j-schmizzle Rockstar 4 Years 1000 Posts

    i have a 2000 silverado 5.3L with 154k. i've used 5w-30 for the last 6 years and no problems
  3. 2COR517

    2COR517 Epic Member 5+ Years 1000 Posts

    Wouldn't hurt to move up to 10W-30 if your miles are getting up there. I am switching all mine to 10W-30.
  4. bigdaddy77084

    bigdaddy77084 Rockstar 4 Years 500 Posts

    Thats what I run is a 10w-30 High mileage Dino oil, Castrol or Quaker State. Im not a big fan of pennzoil.
  5. Silverado Junkie

    Silverado Junkie Rockstar 4 Years 500 Posts

    I use 5w30 Castrol GTX with Lucas Oil Stabilizer but my dad uses 10w30 Castrol GTX in his '99 silverado with a 5.3l and that motor ran great until 255,000+ miles and we only put a new motor in it cause dad didnt wana put a new head gasket in a high milage motor like that. But if he woulda changed the head gasket it would still be running great today so use Castrol 10w30 in your 5.3l.
  6. cucu-z71

    cucu-z71 New Member

    well as long as one doesnt do any harm i think ill be alright
  7. MightyMax

    MightyMax Rockstar 100 Posts

    I thought all GM Engines used 10W - 30

    I use 10W - 30 in mine.
    Over 500K on the odometer....(but I believe only around 300K on the engine)
  8. Silverado Junkie

    Silverado Junkie Rockstar 4 Years 500 Posts

  9. bigdaddy77084

    bigdaddy77084 Rockstar 4 Years 500 Posts

    Yep mine say 5w-30 too. But I do the 10w 30.That lucas stabilzer seems to keep my oil pressure up.And is stays up even when its warmed up. And its not as noisy at first start up of the day.
  10. schmule

    schmule New Member

    Any reputiable brand of oil should be fine. As for the weight with that many miles the 10W-30 should be alright... most brands make a high miliage with additives and such all generally will do the same thing. Just make sure you keep up changing all of your fluids, that is what can kill vehicles.

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