haven't been here for a week....got a lot of catching up to read...... one thing ???? FLCaddytech recommended 10w30 for n*s approching 100k.... FLC.... , should i not run a 10w40 weight in the extreme hot weather? I run my n* hard and fast....(.and it likes it.)..... Really should i not run the 40 weight? I'll run a 5 0r 10 w 30 in winter time....but maybe I'm old school, thinking a 40 weight for extreme driving in hot summer heat.... oh its a '99 sts w 69k mi

 

10w40 is just fine.