I don't believe that the owner's manual prohibits switching between synthetic-ester and conventional oils.

I'm not big on "super premium oil hype" but in this case I'm buying only synthetic ester oil.

Regular synthetic oils usually start as petroleum based but are so extensively altered that they are reclassified as synthetic. Synthetic oils provide superior lubrication, reduced friction and longer life. Synthetic ester oil has specific enhancements over basic synthetic oil that are of benefit to the 370Z. Nissan has applied a special finish ("diamond like coating" their term) to reduce wear and friction on critical components. This coating's benefits are optimized when synthetic ester oil is used. The valve train in the Z is especially hard on oil and the high output of the Z's engine creates a lot of heat, accordingly Nissan recommends the very best type of oil and requires frequent oil changes to ensure long engine life. Many oils have some ester characteristics but only a few are classified as ester oils. In our case it's just part of the cost of having a light weight, compact, high output engine.

I was wondering..what is ester,...and why cant you go back to regular oils if you use synthetic with ester?

Doing fine. Been working on a baseboard replacement project that happens when I've got some downtime.

Hey there ...how are you?

The wife and I have been helping a friend redo her patio and yard. I got your message, I have to apologize for not responding. I'd be delighted to have that conversation Monday, Tuesday or Wednesday of this week if that works for you. My home line is 949-589-4664 or my cell is 959-510-4920.

Where you be? Havent heard from you in a while..i Hear the price of gas is around $5 in California..

Glad to hear that the tires seem to be working out.

Just to let you know..it seems the Z is more quiet with these tires...the more I travel around the more I notice it..i think it is just perfect now! Of course and extra 10 miles per gallon and fifty extra horses with no change in the ride or noise would be welcome!

Your transmission should be just fine.