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Reserve 100% oil remaining

Toby0666

New member
I have a Mercury 2004 150xl hp
When I run the motor I get message Reserve 100% oil remaining.
It also reduce capacity to 20%
Why is this? I understand if it alarms when there is oil missing but when it is 100%
I have full oil in the oil tank in the engine and half in the external oil tank.
 
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