Hello, I am currently breaking in my engine. For the first start I used Driven BR30 break in oil. At first oil pressure was okay, a little lower than what I would consider normal however as the motor got to operating temperature the pressure dropped significantly, at idle it got to 7psi and I killed it, my builder advised me to continue break in as long as oil pressure continued to rise as the RPM’s did. So I continued break in. Oil pressure was a constant 39-43 between 2500-4000 rpm so I continued break in. When I pulled out that oil it came out watery so I suspect the car is running too hot for 5w-30 in hindsight. After that I put in Dino 5w-30 with ZDDP additive and began driving. It stayed at decent pressure the rest of that drive ~20 miles however the next drive as the car heated up oil temps got significantly lower. To the point it stayed around or below 1psi per 100 rpm. I am wondering if I should put in a heavier oil and if so what should I use?