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Thanks everyone. I understand high temperatures mean lower viscosity which results in lower pressure.
Oil cooler also reduces pressure at all temperature ranges. At 260°F the oil viscosity is 7.8 and 8.4 approximately for Pennzoil euro L 5w30 and Mobil1 FS 0w40, assuming oil cooler kept temperature at 212°F the viscosity would have been be 12.5 ans 13.8 instead. My question would be which is lower
Oil pressure at 260 without external oil cooler
Oil pressure at 212 with external oil cooler
I understand at say 300°F as highest temperature without oil cooler, it would be better to have oil cooler and lower temperature. And at low temperature it would be worse to have oil cooler, pressure wise. What's the tipping point? 260°F? If so why?
Sorry about lots of questions, just trying to understand and thanks everyone for reply.
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