I did enjoy the track day, thanks! It's just that little scare at the end that got me.
I had a whole saga on this forum over the span of 4 months back in 2021 about low oil pressure, but back then it was due to the oil being over filled/pick up clogged, I never found out the true cause. This was from dodgy maintenance by the previous owner, and I got the light literally the next day after buying it off them (doing some hard acceleration, but the light only popped up when slowly driving around an estate at low RPM, and then later again slowing for a red light after hard acceleration) , and unfortunately it was a private sale so there was no going back.
The oil had metal shavings in it. After replacing the pick-up, pump chain cover and even the big end bearings on the rods, the issue disappeared and the oil pressure tested fine, measuring within spec using a proper oil pressure gauge. Each subsequent time I changed the oil afterwards there were less and less shavings, so the issue should have been sorted. Engine compression was fine too. The last oil change I did had no visible metal, even a holding a magnet to the used oil pouring out of the sump didn't affect it, unlike with initial oil changes.
On the track today it happened at at least 3k RPM around a sharp bend, a completely different scenario to last time. The measurement of the oil after I took afterwards was on a hot engine, I've not checked the cold level but I bet it's much lower than the 60% on the dipstick I measured.
It's also worth noting my oil level sensor may be broken, a Mechanic's
Delphi scan once showed a 00562, oil sensor 'short circuit to positive or open circuit' 'intermittent'. And I've never gotten a low oil light, even despite my oil once going below min.
I choose to believe it's the oil level and sharp bend that caused it, because I can't fathom digging around in the guts of the engine again for months trying to find the cause