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Chevy ran about 40 psi to 60 psi when on highway with 10W40 oil Had oil changed they used 5W30 now oil pressure is low less than 20 psi and engine knocks in Chevy S-10 pickup what happen?
Wiki User
∙ 15y ago
10w40 is a thicker oil than 5w30. I would only use 10w40 in an older motor in the summer, if the motor was using too much 10w30. The thinner oil will not have the higher pressure. Pressure that this motor needed.? I would go back to the 10w40 and see if the knocking stops...the damage may already be done.
Wiki User
∙ 15y ago
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