Low oil pressure, 914 new owner Options

[Ratrod87]

Hello everyone , I've have been try to use the search engine to try to find some answers to my issue but I can't seem to come up with what I need to know. I apologise for asking so many questions and Im really greatful for everyone's help . So my son recently changed the oil in the car and we haven't really driven it much before that, when the engine is cold (2.0 bus engine with hydraulic can so I've been told by PO) it has really high oil pressure around 80 psi but as the engine warms up it continues to drop the hotter it gets. At idol when at operating temperature it is around 20psi or less and increases with Rpm. Napa said I needed 20-50 motor oil . I've never had a Porsche or vw before so I'm not sure if this is normal. Do I need different oil? Someone said get rid of the hydraulic lifters. Any suggestions or knowledge would be greatly appreciated. Thanks Jerry h