Re: 10w30 or 10w40 oil for v8 laredo?
No advantage. I would, and do, use 5/30.
Unless you live in alaska, All the oil specialist stuff between 5w30 and 10w30 doesn't mean squat in real world application. It won't be the difference between your engine going 150k miles or 250k miles.
Keeping a 4.7 full of oil and changing it every now and then with a wix filter. That will make the difference.
13 Durango 5.7/66rfe
05 LJ 4.0/370/241OR/D44/D44 4.10s 37"mtr
01 XJ 4dr 4.0/AW4/231/D30lp/D35 4.10s 30" BFG
98 xj 2dr 4.0/AX15/D30hp/231/8.25 3.07s 33s