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Purchase check: dyno test or oil sample?

Discussion in 'Ask An Owner Operator' started by DechkoTzar, Aug 19, 2020.

  1. Aug 19, 2020 #1
    DechkoTzar

    DechkoTzar Light Load Member

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    Apr 26, 2015
    0
    What do you find more reliable way to check a used truck before purchasing: dyno test or oil sample?

    If dyno test: what are desirable results of the test?

    If oil sample check: how to read the results and what information would make you decide to proceed with the purchase or retreat?
     
    DechkoTzar, Aug 19, 2020
    DechkoTzar, Aug 19, 2020
    #1
    kimbosa Thanks this.
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  3. Aug 19, 2020 #2
    Spyro2112

    Spyro2112 Medium Load Member

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    Mar 17, 2018
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    They change the oil, dyno wont tell you much, drive, have another mechanic look at it, look for blow by start the truck open the fill tube for oil see how much smoke comes out, get maintenance report, any maintenance recipes
     
    Spyro2112, Aug 19, 2020
    Spyro2112, Aug 19, 2020
    #2
    DechkoTzar and kimbosa Thank this.
  4. Aug 19, 2020 #3
    Ridgeline

    Ridgeline Road Train Member

    22,442
    117,088
    Dec 18, 2011
    Michigan
    0
    Both, plus a blow by.

    Blowby is only tested with the truck running under maximum load.

    The dyno operator will tell you the tolerance of blow by. Depending on the age, you should take off the list any truck making less then ~75% rated HP.
     
    Ridgeline, Aug 19, 2020
    Ridgeline, Aug 19, 2020
    #3
    DechkoTzar, kimbosa and Speed_Drums Thank this.
  5. Aug 19, 2020 #4
    mnmover

    mnmover Road Train Member

    1,237
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    Apr 5, 2009
    Lichfield MN
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    rigdigreport.com like a car fax for cars only for trucks. Also tell the dealer not to change the oil until you have had ability to get a sample for testing.
     
    mnmover, Aug 19, 2020
    mnmover, Aug 19, 2020
    #4
    DechkoTzar and kimbosa Thank this.
  7. Aug 19, 2020 #5
    kimbosa

    kimbosa Medium Load Member

    524
    351
    Jul 4, 2011
    lufkin texas
    0
    NOW THATS A COOL SITE!!!!! THANKS MNMOVER
     
    kimbosa, Aug 19, 2020
    kimbosa, Aug 19, 2020
    #5
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