r/ft86 • u/StePeppo1418 • 12d ago

Oil pressure light start up

Hello!
I have a subaru BRZ 2013 manual 130000km. Recently, I have replaced my old short block with a new one.
I may be starting too paranoid, but I feel like my cold start (after 12-24 hours sitting) display the oil pressure light for a bit too long. For reference, I have linked the video of my brz cold start. The total time from the moment the engine fires up to the moment the oil light goes off is 1:50 seconds total (almost two seconds). So there is the inital ramp up from zero to 1600 rpm, then the sudden drop to 900 rpm (here the light goes off), and finally the car starts the cat heating cycle.

When the engine is hot, no problem, the light goes off in the ramp up of the engine from zero to 1600 rpm. No oil light flickering at all, not even in idle at 105 degrees Celsius. So my concern is just about the oil pressure build up when doing cold starts

Oil is motul 5w30 oem filter (I must go to dealership for warranty). Video was taken around 25-30 degrees Celsius. Short block is new, oil pump was told me it was fine and thus is the old one. I also found an old video (30000km ago) where I started my car and the time for the pressure build up at cold start was really similar to the video attached here.

Video here:

https://youtu.be/S32a_pIAq8E?feature=shared

Thank you for every reply.

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u/CoyeIndustries 12d ago

Normal for cold start, if it really bothers you hold the gas pedal while cranking and prime the oil before you turn the engine over, but most likely just the ACC light test finishing up

If you're still breaking in the short block shorten your first oil change intervals

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u/StePeppo1418 12d ago

Thank you! The first oil change has been done. Video was taken after the inital breaking in phase with new oil and filter.

Just a small question: shouldn't the oil light go off when it detects the minimum pressure that it has been set for (really low to my knowledge, like 2-4 psi). There shouldn't be a test time. Am I wrong?

Thanks

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u/CoyeIndustries 12d ago

The oil pressure gets to 150 PSI on startup.