93 fox with a 347 stroker. Today its about 93 degrees out and my mustang started running about 10-15 degrees hotter. It runs almost near 220 degrees but i try to keep it around 210. Oil pressure is getting close to 22 psi with all this heat. Usually maintains at about 30 at idle. Im running 5w30 for oil right now as i have for the last 2 weeks. Think its time to get something thicker?