Originally Posted by Triple's (Post 1568988)

Good to hear they're doing the right thing :tup:

Originally Posted by MightyBobo (Post 1569009)

Fixed. AND YOU CALL YOURSELF A MOD!

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Originally Posted by Speedy (Post 1569003)

Interesting thread. Since I just got my Z so I'll definitely keep my eye on the oil level. Anyone got a link to the TSB? If it was posted sorry I missed it.

I haven't had mine long enough to do the first oil change, but I do all my own work. I'm OCD so I keep all my receipts from oil changes as well as a maintenance log book in the car (helps with resale).

I see a lot of misconceptions in this thread as well revolving around warranty. Dealerships CAN NOT void your warranty for doing the work yourself unless they can prove you caused the problem. There are laws against this. The only way a dealer could have such a policy is if they provide free oil changes to their customers.

It's the same reason they can't force you to use their oil or filter.

To the OP, it wasn't the Mobil1 that was the issue. If you burned 5qts in 5,000 miles there was something major wrong going on.

Maybe these cars need a 5W40 or 10W40 weight oil.

Originally Posted by Synack (Post 1569035)

Oh I definitely agree with the different weight oil. Hell we used 5W-30 in my Cobalt and that's a completely different car.

Originally Posted by Speedy (Post 1569078)

Well, my point was that manufacturers spec an oil, in part, to help with their EPA mileage requirements. You can find this as fact by looking at an oil spec for some cars in the USA vs. Europe. Same car, same engine, and completely different oil specs.

The 5W30 for the Z may be a result of an EPA mileage requirement when in actuality a 5W40 or 10W40 would actually work better for the motor.

I have no information to support that theory as of yet, just throwing it out there.

Originally Posted by wstar (Post 1568952)

(And I wouldn't worry about the Dyno numbers. Factory freak-ness is never more than ~1%, the rest is just different dynos and different atmospheric conditions, or factors other than the engine (e.g. gearing, wheel size/weight, etc)).

Originally Posted by Jordo! (Post 1569150)

The factory freak is a myth -- here's the kernel of truth (at least to the best of my knowledge): Older GM cars occasionally had a different cam put in on the assembly line when designated cams were short on supply, and because so many parts were interchangeable. If the different cam happened to have a wilder profile, you lucked out with a more powerful engine.

Originally Posted by wstar (Post 1569196)

Yeah my reference to the ~1% or less factor is that there probably are factory variances in tolerances and adjustments. It's just not enough to matter enough to care about.

Originally Posted by Jordo! (Post 1569252)

Yep. And tolerances have gotten way tighter over the last 30 or so years.

I do bet you will see variance due to break-in success or failure -- that probably accounts for anywhere from 1% to 3% (poor ring sealing, lost compression) to 100% (blown motor! :p )

Anyway, OP, glad to hear you are getting a new short block and no BS from Nissan :tup:

Originally Posted by Synack (Post 1569260)

Thanks, gonna baby it through break-in. Possibly unlike the previous owner...