Dude
That's the worst
Sorry shaz hope everything is ok with her :)
Easy fix tho
Bit of sealant on the corners and perhaps a new gasket but who knows :)

Don't panic Shaz.........at least it failed while it was still with Toyota and you have a loan car.

I would expect that they will only charge you for the initial new rocket cover gasket, and not for the second gasket + labour due to faulty installation.......would that be right Ethan?????

Rocket cover gasket failures can be messy........they may give your engine bay a clean at the same time! Make sure you have them show you the engine bay before you leave, and make sure the engine bay is clean.

The next time you go in, make sure that you request for the most senior mechanic to work on your car, and remind them of this incident......you are the customer, and you are always right!! .....and tell them how important your baby is to you - they always appreciate someone who loves their car!

I am sure everything will be fine, these things happen sometimes :-)

Cheers, M

Replacing those rocker (cam) cover gaskets can be tricky, and they are notorious for leaking even after you fit new gaskets.
I found they need sealant all around the perimeter, and not only in the corners like in the service manual.
Another problem with the gen2 na's is that you can't re-tighten all the holding bolts after you refit the upper intake manifold.

The rocker cover is up top.
 
See here under the 'second generation' heading:
http://jdmspecengines.com/toyota-engines/s-series/3s-ge.html
 
It's the section that those two large gears are on the side of.
Under it is where your cam shafts are controlling cams responsible for air intake (behind the left gear) and exhaust extraction (right one.) Everything up there is lubricated, hence the mess when the seal goes.

 all good.
 
I felt a bit silly asking to have a look at the engine bay, but I did anyway.  It is all nice & clean.  He explained which bit it was that didn't seal properly.
I also suggested that next time he has to tell someone there had been an "issue or problem" with the test drive, to assure them that it isn't an accident.

Smoke will be normal after I did mine it dd it for a few hours until all the oil had burnt away from the exhaust
But leaks aren't normal they cleaned it down everywhere

I'd say
What's happened since it was leaking really bad
Should have seen you dizzy and starter was covered in oil
Since the pressure can't squeeze it out of those gaps anymore

It was either one still not fixed and leaking from there or two more likely is its found somewhere else to leak from
But see how it goes and bring it back if it persists
The guy who did it is a bit- not the best mechanic
Maybe ask for someone else to have a look at it if it has to come back

^^ they said to drop her in again tomorrow morning & they'll get someone to check again.