The new engine has 25,000 miles on it.
How many labor hours are needed to replace an engine? on 1990 Nissan 300ZX
This may vary from shop to shop. I find that the published labor times are sometimes unrealistic and we look at each job like that individualy. 1 1/2 days in some cases and 2 1/2 days in others.
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I have a 90 Nissan 300z and it took me 16 hrs to pull my old engine out of my car and put a better low mileage engine in...1-1/2 to 2-1/2 days is stretching it a bit don't you think