Well it'* going from bad to even worse now!
I changed the oil & filter after using an engine flush to clean out the galleries. I let the flush run for a full 20 mins too. I put in clean oil (Castrol XTR 10W30) & a new Oil Filter (Fram PH3387A - Only one I could get from Walmart on a Sunday
) . The oil is so clean you can barely see it, but the knock & low oil Pressure is still present. So I drove to Zellers & picked up a can of STP Oil Treatment & added that. A very slight gain in Oil Pressure while in Park idling, but no big difference while in Drive or reverse. Besides the Knock is still there too.
My synopsis is one of the bearings are starting to go. There was coolant present in the old oil, most likely from when I R&I'd the rear head. I thought I got all the coolant out, I guess I guessed wrong!
Now this coolant could have eaten the bearings in the bottom end, hence causing all my woes!
The low Oil Pressure is then a result of too much clearance in the bearings now & also why I now have a knock too.
As I can get a whole car for the price of an engine rebuild nowadays, I think I might be in the market for a new car.....