Hey how are you
Yes if the oil gets low enough the oil pressure switch will detcted and stop the car from starting eventually if it get low enough,you can keep adding to it
if the leak is from oil feed line ,that is important since you do not want to loose pressuer while drivinf down the higway and engine gets staryved for oil and will have major damage internaly
now why the $1000 and what is he replacing
is the leak for sure from oil feed line ,not rear main seal, head assemebly are leaking ?
how many miles on the car ? and how much is the loss of oil, 1 quart ,2 quarts etc.. and how long does it take to leak it
can you provide a picture of the area if possible you can up loaded here , usually we pressure wash engine if oil is all over the engine and can not tell for sure
yes you can fix it yourself if we know for sure what is leaking and you have the tolls if needed to fix it ,i do not see why not .
Please let me know
ASE Certified Technician