Supras and most Jap cars use a low pressure high flow oil pump, much different from domestic manufacturerers and "mucle cars". Oil pressure should never exceed 40 psi on a MK3 supra, if it does, the relief valve or spring in the oil pump is bad. And at hot idle oil pressure should be "higher than 4.3psi" thats straight out of the TSRM. Don't forget that oil pressure changes with oil temperature. When I say hot idle, I mean oil temps above 190F degrees.
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