Oil Pressure Drops After High RPM

[JamesSam]

I just did a cold check on the 81. Yes, I need to change the oil, and I also see it's a half-quart low. But it covers the entire area, not just a remnant. The photos you posted it looks like remnant of oil. This cold check is popping the hood and checking the oil level without any engine rotations, and not wiping the dipstick, it shows how everything settled in and at what level since I drove it last week.

Without flash...

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Yes the pic I just posted is cold no wipe. So extremely low then? Damn. I guess that is the  real issue.

 

[JamesSam]

Don't excommunicate me guys.

 

[JD Miller]

Dont rule out that maybe the sending unit is bad

 

[WFarm]

Don't excommunicate me guys.

No Soup For You!

 

[DoubleDingo]

Definitely change the oil and filter now and check for shiny bits in the drain pan. I've never cut open a filter, but that may be a good thing to do as well.

 

[CountKrunk]

My oil pressure dropped due to low oil (duh) mine is burning it up a bit and discovered some engine oil under the truck most recently. At least i think its engine oil, need to actually you know, take a close look at it.

Checked the dip stick after that and ruh roh shaggy i added some more and bingo back to normal. The oil underneath appeared after i garaged it a couple of months ago. Not related to my low oil pressure i described above.

I was also thinking that dip stick looked like there was basically nothing on it.

 

[mibars]

5-30 is too thin in my opinion for a run of the mill small block or big block.

It's a recommended weight for 1990 350 TBI, So at least in 1990 they were designed for that oil weight

Yes the pic I just posted is cold no wipe. So extremely low then? Damn. I guess that is the  real issue.

It looks like there is way below minimum, if it's on a cold engine and it's parked on level ground then it's most likely what dipstick has collected from a dipstick tube on a way up.

Once you rule out low oil level then there is a possibility that something is going on with the gauge too. However knocking is telling it's an oil issue.