Oil pooling in head near front of intake rocker arm shaft (17s video)

[elansprint]

Hello, here is the video:

https://youtu.be/g-hsPf5RQig

I don't believe I noticed this the last time I had the valve cover off. The only thing that has changed since then is oil (syn 5W40 to conv 15W40) and..time.
Unfortunately I don't know many details about the M20's lubrication system so I have no idea whether this is normal, and if not what could be causing it.

Thanks in advance for any information.

[TobyB]

Looks like an M20 to me.

Oil's dripped onto the cam to keep it alive,
and gravity pulls it back down into the pan
to make the trip again.

t
doesn't usually look at such things.

[ADEN]

Nice video i wonder why oil is not spraying all over the place i always thought that oil is flowing everywhere behind the valve cover to lubricate topend lol or maybe this is normal.

[TobyB]

It gets a bit more exciting at 5500, but naw, it's just drip- drip- derp up top.

Now, in the crankcase, there's a bit more to see.

t

[ADEN]

It means that m20 is lacking lubrication to the topend. Mine has a knock noise from one valve and it is more hearable if idle drop to 650rpm .It mean that at idle lubrication is not sufficient. I once tried a can of ABRO premium oil treatment and i noticed that topend noise is reduced noticeably.
I looked badly for the same product where i live with no luck, I heard that oil tratment additive has the zinc thing that flat tappet needs and i think it made protictive film to reduse friction when lubrication is low.