+1, yes, that would be my guess as well with provided information.
If oil light came on with RPMs high it would mean the main bearings on the crank, along with other bearings, would heat up pretty fast.
Many think the oil is just a lubricant, in an engine it is also part of the cooling system.
Losing oil pressure is like losing the water pump, it's actually worse, instant overheating occurs.
Bearings are made of a softer metal, on purpose, if they get too hot they get very soft and "spin" inside the cap/journal.
At that point the damage is done.
When you reduced the RPM and then pushed in the clutch the drag on the crankshaft from the "spun" bearing cause engine to stall, and starter motor doesn't have enough torque to turn over engine with a "spun" main bearing.
When it cooled off the "spun" bearing is, in essence, welded to both the journal and the crankshaft, seizing the engine until bearing is removed.
Yes this would require a rebuild or engine exchange.
As to why it happened, yes could have been the Cam synchronizer failed which would shut off the oil pump, unfortunately this doesn't shut off the engine instantly, so major engine damage can occur.
Could be the oil pump failed or even the high pressure valve failed, diverting all oil back to pan instead of to filter.
Last edited by RonD; 05-17-2014 at 01:29 PM.