Sorry. I would like to share my G and my son latest status again. (If you don't like it, please skip this...)
My son keeps practicing my G recently and he said that my G was very powerful and quick comparing with 2006 TL (3.2V6) from driving school. He said the TL was much much slower. I think that car is already destroyed by those student drivers.
I think I will remove Bilstein PSS10 and put previous Koni + OEM sport springs back on my G when he takes over my G entirely next year. Although my son didn't complain the stiffer ride on PSS10, I think he will like my G more if I remove PSS10.
By the way, if you are driving G sedan(V36) now, you can put coupe OEM sport springs, sway bars, brakes, tires, wheels on your G. In addition if you're willing to buy good shocks like Koni for your G, then your G will become as fun as current Q50 3.7 if not better, I believe.
If you don't change your mind and love another car, I think it will not betray you for at least 10 more years...
Actually I think if you are not addicted to power like me, 2.5 is better way to go. Because 2.5 is just copy of 3.5 which comes with all refine and characteristics of VQ with less torque and power. But you can save gasoline cost and Taiwan auto tax if you choose 2.5...
You also need to follow maintenance schedule. The list is engine oil, transmission oil, air filter, brake fluid, coolant, differential oil, power steering fluid. That's about it. Not many right...
2017 GSF : It's very good. However it's not unusual because I paid so much money... (It should be good)
2007 G35S : It's old and still runs like new with almost no repair(it's already 3 year used when I bought it). That's much more touching and moving for me...
Hoping I can have similar feeling on my GSF after 15 years spirited driving (I don't drive cars slowly but I do maintain it well...)
For me M is just like a new car because its mileage is only less than 80k kms now. So like GSF it should be still good. It's still too new to judge whether this M is a good reliable car or not now. In addition, I feel its engine is still tight (because I always put Mobil1 or better every 5K kms). I believe its engine should keep running faster for another 3-5 years like G in the past.
However I did have one issue with M. My wife complaint that its air conditioner was not cold enough last June. So I bought a AC/Pro and did some refill. Guess what? The air conditioner turned back to normal. Now it's almost August. She still says that its air conditioner is unusual cold!!! So I guess its air conditioner should be good this summer or maybe next summer.
PS: When I did recharge with AC/Pro last June, actually I overcharged it in the beginning because the meter on AC/Pro was totally inaccurate . (Compressor will stop working if overcharged too much) So I released some to let the compressor get work again and borrowed a meter from a repair shop to make sure it's not overcharged...
By the way why my M mileage is so low? That's because my wife's office is only 6 km away and she use it only for local trips which are only 3-6 kms mostly. Although the trips are very short which may hurt battery, in fact the battery in her M is still original coming from Nissan factory in Japan 9 years ago...
PS: This M is already 2 year used when I bought it in 2012.