Quote:
Originally Posted by VCuomo
AFAIK, the factory fill from Nissan is a synthetic blend (part synth, part dino) - I used Castrol Synthetic Blend 5W30 to top off my Z's factory fill.
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The Castrol synthetic blend will be fine for your car. However, it doesn't have the Ester that is in the Nissan oil. People call the Nissan Ester oil a "blend" because it is dino base oil with esters. Esters typically don't come in motor oils (even synthetics) except in the most expensive of them all (Redline, Motul, to name a few). So, if you were using the Castrol syntec blend to get the Esters, its unlikely that you did. You might have gotten some of the PAO additives.