Break-In Schedule for your 2008 Altima is listed on Page 5-19 of your owners manual.I have copied and pasted it below:theoctopussi wrote:...and I changed the oil over to synthetic once my car hit 1000 miles and I broke it in a bit. I did a loooooot of research, and though I didn't find a RIGHT way about engine break in, I did find an average streak of info. Everyone recommended oil changes right after engine breaks in - break periods were discussed from 500 to 5000 miles... but majority were between 500 to 1800 miles. Everyone recommended synthetic. Hope this helps...
CAUTIONDuring the first 1,200 miles (2,000 km),follow these recommendations to obtainmaximum engine performance and ensurethe future reliability and economy ofyour new vehicle. Failure to follow theserecommendations may result in shortenedengine life and reduced engineperformance.
o Avoid driving for long periods at constantspeed, either fast or slow, and do not run theengine over 4,000 rpm.o Do not accelerate at full throttle in any gear.o Avoid quick starts.o Avoid hard braking as much as possible.o Do not tow a trailer for the first 500 miles(800 km). Your engine, axle or other partscould be damaged.