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Suzuki should have stayed with just motorcycles. Anyway, You just had the oil changed. Check and see if they changed the filter also. They may have forgot or were just to lazy. Just a chance the oil filter is bad, I would replace it again(is the oil clean on the dipstick?). Add a higher viscosity oil. At 67,000 miles, you would have to drive dirt roads all the time, with no air filter to get sludge to clog the head ports. Which is slow drain of oil to the pan. The oil pump? well it could be, most likely not. I would say the oil sending unit is bad, but the knocking noise kind of throws that off. Knocking is bad, if it happens again, pull off and shut the engine down. One other thing to watch is the temperature gauge. getting really hot will cause knocking. Check coolant level and the thermostat.
Have a mechanic or shop put a mechanical oil pressure gauge in the oil pressure sending unit's mounting hole. Check oil pressure against the spec for your car. Does the warning light turn on every time this happens? If so, try to check oil pressure when the light is on-you may have an intermittent oil pressure problem, or oil pressure may just be too low. Don't believe it's a sensor, don't know how, but not familiar with your newer ride. Something as simple as a pick up tube gasket that leaks could cause low oil pressure. If that happens, the top end of engine will clatter-not getting enough oil up there.
The fact that the oil was low would not be from the oil pump, but from wear in the engine. If it is not smoking when you start it or as you drive, you can probably keep it running by just keeping the oil level checked at each fuel fill-up. As for the car shutting off, you didn't say if the engine seized or got real hot. A low oil pressure problem should have triggered a warning light before the problem got to the point where you lost the engine.
If the car ran after you added the oil, you got lucky and need to always check it.
It could simply be maybe the person changing your oil never reset the light? or you have a oil pressure sensor leaking or not working.
most of the time its someone never reset the oil change light. even before it goes on it goes by mileage, so maybe it didnt go off yet cause you cnahged it a tad early.so noone even tried to reset it.
I guess you could have an oil pressure problem, but thats going the extreme route.. but if nothing else shows that could be a problem.