Originally Posted By: Grambo
what is with all of this break in stuff, just change it with the synthetic of your choice in my case i used M1 5w30 EP, with great results it was also a brand new motor. The engine does not need to been driven like stole to break the rings in i don't know where guys came up with that? the compression rings and oil scraper ring will set themselves throughout normal driving. I guess you can chalk it up to the internet today.
Actually no, if you read the thread you'll see some people have said break-in should be "drive it like you stole it". The break in the OP and I are referring to is what Nissan actually puts in its owners manuals. And yes, normal driving is what will do it, the claim in some posts of this thread is that above normal driving is what you want to do instead.
Nissan specificall says no over 4K RPM and no steady speeds for 1200 miles.
Its probably not a huge deal with the 2.5L, but the 3.7L in my G has been known to have valvetrain noise which Nissan says doesnt harm the engine, but in the interest of keeping all my ducks in a row I will be sticking to whatever they are putting down on paper.
Within reason, of course.....I still cant bring myself to paying the dealer 50.00 to have an oil-jockey change the oil on my new car, but I will be using 5W-30 synth that the manufacturer says is a direct substitute for the Nissan Ester stuff that Nissan is pseudo-requiring.