Quote:
Originally Posted by L99CAMA2011
What weight oil.
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I used Amsoil 5w30 signature series in the ZL1 and 10w-30 Amsoil Dominator racing oil in the Z/28. I have heard that 15w-50 may cause higher temps due to the oil pump working overtime to pump thicker weight oils. Myth? Not sure but it seemed my oil temps were higher with 15w-50. My oil pressure seems ok but it drops significantly when the temps are high (290-300°F). At idle, my oil pressure is usually 2.8-3 bar but will lower to 1.0-1.2 bar at idle when the oil is scorching hot.