Average Wear
Reference Guide
This page shows standard wear references — useful for a general comparison. But for a personalised result for your exact vehicle, the AI scan gives you a full engine health report in about two minutes.
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The Diesel Engine Guide
Use this reference to understand what a baseline healthy diesel engine looks like — then compare your blow-by result against it.
Average Wear
Mileage estimates based on diesel engines.
0 - 160k Miles
There should be no visible green. Brand new diesel engines with 0 miles can still pull a teal color.
160k - 240k Miles
Average wear will start pulling more green color due to gradual cylinder wear however it should be a darker green. A well maintained vehicle can still pull a teal color.
240k - 320k Miles
Average wear accelerates and will start pulling in the yellows which creates the lighter green color. A well maintained diesel in this range can pull a dark green color.
320k+ Miles
Noticeable wear begins over 320k miles, though well-maintained vehicles may still pull green. Yellow indicates the engine is nearing the end of its life.
*Please refer to our terms and conditions. Test results are provided for informational purposes only and are not a substitute for professional diagnosis, advice, or servicing. Results should be used as a guide in conjunction with other diagnostic methods. We do not assume liability for any decisions, repairs, or outcomes based on the use of this test.
How Blow-by Works
Watch how blow-by builds as an engine wears. Hover over the chart to zoom in, or tap it to view it full-screen.
How blow-by Builds up
(As the rings and cylinder wall wear)
The more blow-by in the crankcase, the further the ExhaustIQ fluid shifts from blue toward yellow.
Find out where your engine stands
Use our AI fluid scan to get a full wear report for your specific vehicle in about two minutes.
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