Pelican Parts Forums - Where is molybdenum in our engines?

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Where is molybdenum in our engines?

I do oil analysis relatively frequently on my motor... In a recent anlysis moly went up to 13ppm from the typical 0-3ppm. Any idea where it might come from?

A few years ago I had a bump in titanium from very low levels (0-2ppm) to around 25ppm. Only place I knew that my motor had Ti was on valve retainers and could not figure out why they would be "wearing". Turns out I had a broken inner valve spring and it must have been scraping retainer.

...So, I like to check these things out. basic run down of motor.

964 crank
carillo rods
mahle 3.8 p/c
993 heads
factory and Intervalve valves
ebs race springs w ti retainers
solid factory rockers in 993 cam towers
daugherty cam
running brad-penn 20/50

Chrome molybdenum is a common steel valve spring retainer material. Did you change out those Ti retainers for steel by any chance?

Thanks the the thought however got new Ti retainers with the new EBS springs.

And there we have the value of having an oil analysis done.

http://wearcheck.com/virtual_directories/Literature/Techdoc/WZA047.pdf

MOLYBDENUM (Mo) sources:

Piston rings, synchro rings, oil additives, greases, solid additives (anti-friction), internal coolant leak.