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Recently I’ve been trying to diagnose an oil pressure issue on my evo. Everything seems fine until the higher rpms. At idle it’s always at around 20psi fully warm. Cold starts idle around 80-90psi. After it is fully warm and I do a pull the oil pressure sort of caps out at around 75psi. It climbs up until about 4500rpm and just sits at 75psi until redline. I have tracked the car with this problem and each lap I saw lower pressure. After my third lap it was at 55psi near redline. I do know oil obviously thins out the hotter it gets but that can’t be normal. Has anyone had this problem?
Was running AMSOIL 5w-30 then switched to AMSOIL 10w-30 hoping for better results but they were the same.
 
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