oil pressure
maybe a lighter weight?
also if opti failed causing the car to not run and it was cranked and trying to start you could have fuel in the oil which would thin it and could cause lower pressure
mechanical gauge as mentioned by others is a good route as well
good luck
maybe a lighter weight?
also if opti failed causing the car to not run and it was cranked and trying to start you could have fuel in the oil which would thin it and could cause lower pressure
mechanical gauge as mentioned by others is a good route as well
good luck

