I have an '07 G35S with 116k miles. The previous owner had the dealer do all maintenance, and they used Mobil Special 5w30 until I bought the car at 104k. Since then, I've used Pennzoil Platinum 5w30, and most recently, Castrol Edge 5w40. The issue I was having with the PP is that in warmer ambient temperatures, it would have a bit of valvetrain tic. The noise wasn't present in cold weather. I figured a 5w40 would help, but now it's slightly worse and a bit louder at all temperatures.
I know there's no magic bullet here, but some oils seem to be quieter than others. Any recommendations for a good 5w30 or 5w40 for these engines? Valvoline Maxlife is on sale right now, and I was thinking of giving that a shot.
I know there's no magic bullet here, but some oils seem to be quieter than others. Any recommendations for a good 5w30 or 5w40 for these engines? Valvoline Maxlife is on sale right now, and I was thinking of giving that a shot.