What are you running the 10W-30 in and what brand?
I'll start off. . .
2000 Buick Lesabre - Maxlife 10W-30
1997 Chevrolet C2500 Pickup - Maxlife 10W-30

I'll start off. . .

2000 Buick Lesabre - Maxlife 10W-30
1997 Chevrolet C2500 Pickup - Maxlife 10W-30