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I have my UOA back, and the lead is high.

Discussion in 'XJ Technical Chat' started by wrenchmonkey, Oct 8, 2014.

  1. wrenchmonkey

    wrenchmonkey Member

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    1981 XJ750RH. This is a UOA on the first regular oil change after the break-in oil change. I have 3700 kms on the oil (Rotella T 15W40) and the lead content was 291 (universal average is 150). Tin was 10 (universal average is 6). I'm starting to think the engine was not fully broke in during that time. The fuel dilution I had from earlier was minimal so that should not be the issue. I have to put another 1000 kms on the new oil and send another sample. I hope the bearings are not damaged. Let me know your thoughts on this.
     
    wrenchmonkey, Oct 8, 2014
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  2. schmuckaholic

    schmuckaholic Well-Known Member

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    ...and for those of us who aren't familiar with "UOA"... (googles) Ah, "Used Oil Analysis". Got it.

    I don't know the first thing about what should or shouldn't be in used oil, but tin and lead... are your bearings made of electrical solder? ;)
     
    schmuckaholic, Oct 8, 2014
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  3. wrenchmonkey

    wrenchmonkey Member

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    More or less ya it's the same stuff. The first layer of the plain bearings are a lead/tin alloy. Sorry, I should have said used oil analysis along with saying UOA. Forgot :p
    I have a suspicion that the next sample will come out better. Time will tell.
     
    wrenchmonkey, Oct 8, 2014
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