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Q:

estimate for engine oil flush on 2000 Infiniti I30

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
an engine oil flush was recommended due to age of car.
(3) Answers
I don't recommend this service, it is a profitable service for the shop, but provides little to no real benefit for your car. Keep your oil changed regularly and you'll e fine.
Oil flush should really be called a "sludge flush" ! Once oil has been used long past its serviceable life it starts to slow down, become guey, gummy and thick. Add heat to this and it will eventually become sludge, so thick that is next to impossible to get it off.
The only real way to get it off is like spraying oven cleaner inside an oven, let it sit for two hours then clean the oven. Motors in cars wont stand the equivalent of oven cleaner because the motor has to be running for it work. The only alternative is to start to take the motor apart and literally blast the caked-on, baked-on sludge from parts of the lNSIDE the motor! NO SUCH THING AS ENGINE FLUSH