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castrol 10w30 semi synthetic instread 15w40 for high milage C15 475hp

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by bob1974, Dec 23, 2022.

  1. Dec 23, 2022 #1
    bob1974

    bob1974 Bobtail Member

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    Dec 23, 2022
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    first time i am using 10w30 semi syntheitic in c15 is it safe to use it using semisynthetic for C15 475hp ??
    since i changed no issue on ideling anymore b4 it shakes for half minues when i start after turning off for 15 mins Please any help
     
    bob1974, Dec 23, 2022
    bob1974, Dec 23, 2022
    #1
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  3. Dec 24, 2022 #2
    Lazer

    Lazer Road Train Member

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    We use ‘synthetic blend’ 15w-40 in everything we have, CAT, Cummins, Detroit’s, MB’s. All ‘unbranded’ suppliers, never had an engine problem that could be traced back to the oil.
     
    Lazer, Dec 24, 2022
    Lazer, Dec 24, 2022
    #2
    Diesel Dave Thanks this.
  4. Dec 27, 2022 #3
    bob1974

    bob1974 Bobtail Member

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    Dec 23, 2022
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    what is diffrent between semisynthetic and blend synthetic?
     
    bob1974, Dec 27, 2022
    bob1974, Dec 27, 2022
    #3
  5. Dec 28, 2022 #4
    RubyEagle

    RubyEagle Medium Load Member

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    The Delo 10-30 bottle claims better protection than a 15-40. I had good oil samples with it in a DDEC 3 Series 60. It will flow faster and you gain fuel milage with it most likely. Flows faster during cold starts good for winter.
     
    RubyEagle, Dec 28, 2022
    RubyEagle, Dec 28, 2022
    #4
    brysol01 Thanks this.
  7. Dec 28, 2022 #5
    Cat sdp

    Cat sdp . .

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    Local cat house only has 10W30 in bulk at their shop. They advise to use that grade year round.

    Ive used full synthetic for ever in a E model and then a C15. The c15 has 630K and like 22k hours on it. You might develop some oil leaks but that’s it ……

    As far as the difference between a blend and a semi . I don’t think there is one…… all semi synthetic oils are part Dino and part synthetic I believe ?

    we had some oil experts on here maybe someone will chime in…
     
    Cat sdp, Dec 28, 2022
    Cat sdp, Dec 28, 2022
    #5
    Oxbow Thanks this.
  8. Dec 28, 2022 #6
    Magoo1968

    Magoo1968 Road Train Member

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    St Malo mb
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    Is bob the oil guy still around
     
    Magoo1968, Dec 28, 2022
    Magoo1968, Dec 28, 2022
    #6
    Oxbow and Diesel Dave Thank this.
  9. Dec 29, 2022 #7
    bob1974

    bob1974 Bobtail Member

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    Dec 23, 2022
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    yes thats is why for this winter i am using 10w30 semi synthetic easy start in winter

    but still looking for advice for high mileage truck which wil be good any cat oil expert please advice
     
    bob1974, Dec 29, 2022
    bob1974, Dec 29, 2022
    #7
  10. Sep 30, 2024 #8
    Heavyd

    Heavyd Road Train Member

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    15W40. Lighter grade of oil for newer engines to reduced internal drag and increase mileage. Not a fan of thinner oils and extended intervals.
     
    Heavyd, Sep 30, 2024
    Heavyd, Sep 30, 2024
    #8
    AModelCat and Oxbow Thank this.
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