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Everything on the engine besides the block is LS3. The pickup tube and oil pan is off LS3. I change the O-ring for the pickup tube with the new melling oil pump. I change out the oil pressure sensor and I checked for any blockage. Right now I'm using 5 w40 Oil. And as far as oil level goes on my dipstick it says it's perfect I don't know if that would matter since I'm using a LS3 oil pan and pick up tube? Somebody told me that in the oil pan that part that sticks up. That I need to replace it it looks like it's on top of the oil filter and it goes straight up into the block. But I'm not too sure about that.