Tonight while out running my boat with a 1989 5.7 cobra the oil pressure was reading as high as 70 to 75 psi at 3500 rpm and at idle speeds it was reading 40 to 50 psi. The engine was good and warm and the ambient air temp. was in the low 80's
It has always read 60 psi at 3500 rpm and around 35 to 40 psi at idle speeds.
The engine was good and warm and I am running Valvoline conventional SAE30 oil and the engine has almost 40 hours since the last oil change this past spring.
Also I use a oil additive called cam shield which increase the zinc phosphorus levels to acceptable levels for flat tappet cam protection that the new SM rated oils don't provide.
The oil filter is the correct Evinrude Johnson filter which was changed at the last oil change.
I know this could be a oil sender or gauge issue but I and a bit concerned since this just started to happen today.
Yesterday the oil pressure was normal.
Any ideas and other than a sender or gauge issue what could be causing this and what issues or problems could this cause?
Thanks
It has always read 60 psi at 3500 rpm and around 35 to 40 psi at idle speeds.
The engine was good and warm and I am running Valvoline conventional SAE30 oil and the engine has almost 40 hours since the last oil change this past spring.
Also I use a oil additive called cam shield which increase the zinc phosphorus levels to acceptable levels for flat tappet cam protection that the new SM rated oils don't provide.
The oil filter is the correct Evinrude Johnson filter which was changed at the last oil change.
I know this could be a oil sender or gauge issue but I and a bit concerned since this just started to happen today.
Yesterday the oil pressure was normal.
Any ideas and other than a sender or gauge issue what could be causing this and what issues or problems could this cause?
Thanks