Why all of a sudden is my oil pressure dropping?

[nucleus]

10w will go through an old engine like real Mexican food through a gringo. 20w is better - I run 30w until I can afford a rebuilt long block (it stills smokes, but consumption is down)

I prefer 'straight' weights rather than blends. If your cooling system is working ok then your engine running temp should be consistent. Starting temp makes some difference with heavier oils (unless garaged or not in a cold climate)

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: 69 C20
: anything with tits or wheels is nothing but trouble ...