Another Vegas Run and Oil Temps scared me

Lug

Nissan put a throttle limiter in at 280 because they think you may get excessive bearing wear at 300. If Nissan thinks your car is fine at 260, I don't know that anyone here has the technical know how and access to Nissan data to really be able to refute that. Remember, the 280 limit is just a precaution, not an engine failure.

__________________
keep Chubbs in your pocket - Chubbs

370Zsteve

Since thermal breakdown occurs over 240F, I'd wager that 260F is not a positive thing. Modshack posted a graph showing oil viscosity breakdown a few months back.

__________________
SOLD MY Z MARCH 2018 - another Core OG moves on - new ride 2019 Z Corvette Grand Sport - no mods necessary but already have eyes on HFC and intakes LOL IT NEVER ENDS.

WarmAndSCSI

That's fine and dandy, but even Nissan cannot predict what will happen if you're pushing oil temp that high on X, Y, or Z oil. Different oils have vastly different protection levels at a given temperature.

I have to say, 260-280 is very high for a Group II-based oil (conventional). Those kinds of sustained oil temperatures are the reason we have synthetic oil available anyway.

After looking at UOA reports on Nissan Ester Oil on normal change intervals, it would be kind of scary to push 260-280 degrees on an oil with relatively low viscosity at temperature.

That said, 260 degrees is nothing for an excellent Group IV or V-based true synthetic oil. Using a good oil will net you some peace of mind, at the least.

__________________