Did I toast the engine?

[Jake Raby]

Originally Posted by Jager

Low oil pressure and AOS failure at the same time seems strange to me… Would loss of oil pressure cause a premature failure of the AOS?

Not strange at all.. Just a different mode of AOS failure. The AOS fails and direct manifold vacuum sees the crankcase in excess of 24" of water. This creates turbulence in that impacts the pool of oil in the sump, and pulls it away from the pick up tube, as well as creating extreme aeration of the oil.

Aerated oil has no ability to create pressure, and has no film strength.

Completely normal, and expected. This is by far the most harmful of the 4 ways that an AOS can fail.

The loss of oil pressure does not cause the AOS to fail, in fact the primary and secondary issues are inverted from that.