Silicon level way high in oil analysis please help

Discussion in 'Volvo Forum' started by Rasim, Mar 19, 2017.

  1. Rasim

    Rasim Light Load Member

    96
    16
    Jan 24, 2014
    0
    I am looking to buy a truck and i am not sure if this is 100% red flag or maybe oil was contaminated during oil removal process or analysys machine screwed up.

    I want to make sure that the truck will run before i pay a lot of money. The owner did tell me that the coolant level gets low and he adds a little coolant after every two weeks.

    I went to check out the truck and it looks really good almost brand new tires and i have noticed grease on the front of the engine and it does look more like coolant escaping from somewhere. The oil looked clean to the eye no symptoms of contamination. Test drove the truck and it drove nice.

    The engine is a 1999 12.7 detroit and it was overhauled by freightliner 400k miles ago w cost of $16,000 have seller has paperwork.

    He did not change the oil the current oil has about 15k miles in it. The Silicon level seems way high. Abnormal level is 30 and Sever level is 60 and on the analysis it is 497????

    what can this be? Could it be from coolant maybe entering but burning up before it mixes in the oil? Everything else seems normal and wear levels are normal.

    Please help
     

    Attached Files:

  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. xsetra

    xsetra Road Train Member

    5,094
    6,941
    Aug 21, 2011
    0
    It was explained to me. Silcon (Si) is dirt.
    Potassium(K) and Sodium(K) come from antifreeze.
    Maybe ask if you can send in a sample to compare.
    Good luck.
     
    KB3MMX and Ooops Thank this.
  4. AModelCat

    AModelCat Road Train Member

    28,848
    154,273
    Jul 7, 2015
    Canuckistan
    0
    Silicon I believe indicates dirt contamination. Could have been as simple as not cleaning thoroughly around the sample port or plug. Even dropping a bit of dirt into the bottle is enough to skew the results. I would have it re-sampled and make dang sure everything stays super clean. If the second sample shows the same results, there's a good chance the engine is sucking in dirt somewhere.
     
  5. Ezrider_48501

    Ezrider_48501 Road Train Member

    3,845
    5,130
    Apr 2, 2011
    bismarck, nd
    0
    silicon is dirt can indicate bad air filter cracked boots/hoses leaks between the air filter and the turbo. i would expect to see high iron and chromium and possibly other wear metals with a real high silicon number. having trouble reading your sample on the screen. but if you have real high wear metals along with the silicon i would walk away from the truck. if wear metals are normal i would assume contaminated sample and take a second sample.
     
  6. lilillill

    lilillill Sarcasm... it's not just for breakfast

    5,642
    13,470
    Nov 7, 2007
    Possum Booger, Alabama
    0
    KB3MMX Thanks this.
  7. Mark Kling

    Mark Kling Technology Contributor

    10,935
    4,214
    Sep 23, 2007
    Statesville, NC
    0
    Coolant is a sealed system.. why would they keep adding if not losing it somewhere?
     
    KB3MMX Thanks this.
  8. Trkr3529

    Trkr3529 Light Load Member

    104
    66
    Feb 14, 2016
    0
    Silicon is dirt and dirt will elevate te wear metals real fast so will coolant in the oil, unless you see coolant leaking it's getting burned in the engine, coolant in the oil will stipulated the bearings, the only way I would buy this truck is if I had the budget to in frame it shortly after
     
  9. Cowpie1

    Cowpie1 Road Train Member

    5,569
    4,651
    Nov 25, 2008
    Kellogg, IA
    0
    Silicon is indeed from dirt contamination and If silicon was from poor air filter or similar, then there would be a corresponding higher levels of wear metals in the UOA because it would have been eating away at the engine internals over the OCI. This seems clearly is a result of sloppy oil sample handling, either in gathering the sample or a dirty test machine. It doesn't take much to skew a sample.
     
  10. Aradrox

    Aradrox Heavy Load Member

    900
    622
    Jan 21, 2016
    0
    Can't remember who hosts the show or Wich day but if you got XM radio one of the hosts does a show that is about this stuff buying trucks running the business side of things but he also gives advice on oil samples and what not seems pretty knowledgeable about them... Channel 146 if you got it
     
  11. Cowpie1

    Cowpie1 Road Train Member

    5,569
    4,651
    Nov 25, 2008
    Kellogg, IA
    0
    One thing to keep in mind on oil samples, when one area of the sample if elevated, there are corresponding changes to other areas of the oil sample. Oil sample analysis is as much an art form as it is science. One has to look for patterns and changes over time with multiple samples. A wild spike in one area, with no corresponding change in other areas implies a poorly taken oil sample. The OP's sample shows no elevated levels in lead, tin, Iron, copper, chrome, etc. All of which would have been affected by high silicon in the oil. Viscosity and oxidation are well inside normal limits as well.
     
    xsetra and uncleal13 Thank this.
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.