I never said it was equivalent.
I read your post.
A low oil light comes on any time the vehicle detects 2 quarts low or more on oil ( this is for all manufactures ).
This is patently false.
While, in some circumstances, two quarts low may be sufficient to cause the pickup tube to lose coverage, you cannot say this for absolute certainty as this depends on the vehicle's orientation at the time.
Further, the light that is coming on in such a situation is the oil
pressure light, triggered by a
pressure sensor.
Finally, the vehicle is not "detect[ing]" oil level in any way. It is detecting pressure and only pressure.
When these patent inaccuracies of yours were pointed out, you attempted to assert that the oil pressure light was somehow a legitimate and intended substitute for an oil level monitoring light. It is not and no engineer intends it to be used as such, despite your claim that the low pressure light is "used for both."
Had you simply said, "I meant that the oil pickup tube would almost certainly be uncovered at 2 quarts low on a 5 quart system and that, therefore, the oil pressure light would be on," I doubt anyone would have continued to press the issue. However, you said that the oil pressure light is "used for both" which implies that the light is intended to have a use equivalent to an oil level monitor. This is not the case.
It's certainly possible that wasn't what you meant to say, but the fact remains that it is indeed what you
actually did say.
At two quarts low on his Sonata, the low pressure light will come on...
I agree that at two quarts low it is likely that the oil pickup would be uncovered given that, in the Sonata, that would mean he only had 3 quarts in a 5 quart system. However, on smooth level ground without corners it's also possible, that it was just barely OK. Without knowing more, it's really not possible to tell.
That said, at 2 quarts low, the pickup tube should definitely be coming exposed in longer corners like entry and exit ramps due to the centrifugal effects of inertia on the oil remaining in the sump which would cause the low pressure light to at least flicker in either right or left corners depending on where the pickup tube is oriented on the Sonata's engine.
ZV