Mobil 1 Extended 5/30 10K; Tacoma 140K

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I run m1 EP at 12K intervals in a tacoma. M1 EP virgin oil has iron in it.
 
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To me excellent is less than 0.5 PPM per 1k mile, 0.6-1.0 PPM is very good, 1.1-2.0 PPM is good, 2.1-3.0 PPM is fair above 3.0 is not so good.
 
I didn't find acceptable limits on Wix's tribology website. I was comparing to wife's 6ppm in her Lexus with 170k. Thanks for info.
 
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Found this at rsareliability



I can breath better.



Table 5 : Engine Problems Analyzed through Oil Analysis

Metal Traces Limit Engine Problem What to Check



Silicon 10 - 30 ppm Dirt Ingression Air intake system

Oil filter plugging

Oil filler cap and breather

Valve cover



Iron (Fe) 100 - 200 ppm Wear of cylinder liner Excessive oil consumption

Valve and fear train Abnormal engine noise

Oil pump Performance problem

Rust in the system Oil pressure

Stuck or broken piston •



Chromium (Cr) 10 - 30 ppm Piston ring wear Excessive oil blow-by

Oil consumption / degradation



Copper (Cu) 10 - 50 ppm Bearing / bushing wear Coolant in engine oil

Radiator corrosion Abnormal noise on operating

at stall speed



Lead (Pb) 40 - 100 ppm Bearing corrosion Extended oil change intervals



Aluminum (Al) 10 - 30 ppm Piston and piston thrust Blow-by gases

Bearing wear Oil consumption

Power loss

Abnormal engine noise
 
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