James250
It takes 30 seconds to do the test. What harm is there?
Ok so let me tell you my experince with a non lexus car. I noticed the car was consuming oil. So I took the plugs out to do compression test. I noticed oil one one or maybe two plus. Clean golden oil. On threads. So I continued with compression test and results were good. So I thought it can be oil from rocker cover gasket so I replaced that. A month later I noticed oil dropping again so I pulled the plugs. Oil again there. I bought oe gaskets this time and made sure I follow specs and torques. 2 months later, oil again. So I started the car and remove the oil fill cap when car was idle rpm. Air was blowing out from the hole.
I didn't gave up there. I removed the cover and used sealant and over tightented the bolts. Still no joy.
So I thought of replacing PCV. I stripped down header, injectors , a lof of stuff to get to PCV. Spent some money for oe gaskets etc. PCV was fine to my disappointment but I still replaced it. Needless to say, the isssue was not resolved.
I then thought it could be valves or maybe oil scrappers. But that means engine overhaul. I left it there.
I took it to a mechanic and told him my efforts. He opened the oil fill cap and said, scrap the car when it dies. Your catalistc convertor will go out next. He was right. Cat took a hit as emissions grew. Car's been scrapped. They end.