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Originally Posted by SoCal 370Z
Nissan states the following in the Owners Manual (see pict below); there is no reference to Nissan's ester based oil in the Service and Maintenance Guide; there is reference of a "recommendation" in Service (shop) Manual, but owner's are not expected to purchase a shop manual. I feel if Nissan is supposedly ahead of the engine design curve then such an ester precautions would not be necessary and the Nissan stated API rating should suffice as this is a mass produced vehicle for the masses to be serviced by standard dealerships and not some esoteric engineering prowess to be serviced by the few who have the qualified fluids to do so. That defeats the premise of the Z from its very origins. Hey, but that's just me.
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This whole Ester thing started with the G37 when they released our engine and people were hearing bad sounds out of the cylinder heads. First Ester oil was the fix, then they did a software update to make sure it ran with less noise even when using normal oils. I don't know the details on what they did w/ the software update, but I presume we have it as well. I'm quite sure that API SM oil of any brand and type is considered appropriate for our engine now, and won't void any warranty. That's probably why they didn't include it in the owner's manual, and why they're not making a big deal of it for our cars: it's expensive (looks bad for them) and it's not really necessary.
But they still reference it as recommended in the Service Manual, and the warranty is a lot shorter than I plan on keeping this engine running. There's a lot of question marks in there, and I wish we had straight answers, but we're not really going to get them, ever. I'd rather waste a few bucks and err on the side of caution.
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Isn't the oil used on the GT-R from the factory Mobil1?
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Yes, but it's a different engine, although it does apparently have VVEL (can anyone confirm that it does, and they're also this same DLC coating?). Factory fill on our cars is Nissan Ester oil, which is more relevant to us.