sluggish? It definately has no problem starting, but doesn't go up to the 1.7-2k range anymore. I know that starts cause most wear, and my car starts MUCH more quieter now (about 0 timing chain rattles), but it also starts 'slower.' Additionally, it seems less responsive? Just the motor, like it is harder to accel. Nothing major, just something only the driver would notice. I was running 10w30 Havoline dino. Car is a VQ35 Altima. I am assuming this is the GC on the job? I must say that even though it is a little more... sluggish, I love how quiet the motor is.