Nissan Ester Oil analysis by BLACKSTONE (at 90K miles)
 

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2010 Sports Package (A/T)

Oil : Nissan Ester
Oil Change Interval : every 5K

lead .. why ??

After evaluating several UOA's from other folks and my old Z, I've tentatively identified between 4 and 4.25K to be the ideal OCI.

It's hard to imagine waiting til 5K is making that much of a difference, but it's possible, and the viscosity was a bit low relative to desired values.

Try around 4K exactly for the next one and see if lead either goes down or at least remains stable.

every 4K.. I agree. It would be better ..

my UOA's always have a TBN done (and after 5K im still at 5-8, where 1 is low) and ive always used pennzoil ultra platinum 5w-30. my OCI is 6K. although, if i get 1-2 track days in, i bring it down to 4-5K.

also, my lead seems to be in the 4-5 range and im at the 40K mark. ill have another UOA in the coming month or so on the new pennzoil ultra platinum 10w-30 :)

Silicon looks a little high. Might want to check clamps\connections on your intakes.

silicon is usually high the first couple oil changes. There is a lot of rtv used to seal this engine and while it is still curing it will break down into the oil somewhat.

but hes at 90k miles. if he changes every 5k like stated this is oil change #18. (also 5k is a little far to be taking ester oil, no?)

Apparently not based on that TBN, but the way that's thinning out I'd be wary of running it out further than that.

I saw one column and looked at miles on oil not on unit :facepalm: don't the blackstone printouts usually show the last few changes so you can see what is actually happening over time or is this the 18th oil change and the first 17 weren't tested.