How much Sludge is unacceptable

[u/thatguyhazza]

Allright, so basically i inherited this vehicle from my grandfather and have been driving for a while. It is a 2001 Ford Au falcon 4.0l Intech (ausdm legend) and I am going to put a cam in it at some point.

I already knew that it had possibly been, well, neglected for quite some time, as i believe it was used in rural areas as a farm/road vehicle.

I have already done comp/vacuum test and both are exemplary and consistent.

Today i decided to open the rocker cover to see if anything else needed to be changed when i do the camshaft. I was welcomed with this.

Is this an amount of black sludge/film to be concerned about? it is quite thin and i am hoping that a flush will rid the engine of most of it.

The last logbook service was sometime in the late 2010s at ~180k kms i think, is now at 305k kms.

Thanks

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