Laxfreak3557

Hello, i just purchased a 1990 GXL and wanted to know what important things i should check first to make sure it continues running strong. It was purchased with only 75,000 original miles and seems to be in very good shape. It generally holds an idle around 700 rpms, never smoke, i just had the oil changed over to 20w-50 and it raised the oil pressure a bit. It is now currently around 35-40 psi at idle and just under 60 psi while there's a load on the engine. Are these good oil pressure readings. I also just had the fuel filter changed. Is there anything else i should check out to make sure i have a good healthy car?