I am thinking of buying another Bonneville. I want ya'lls opinions on weather the 3.8 or 4.6 is better. I ain't goin for what has more balls, i am going for what lasts longer. I know the 3.8 is good, but is the 4.6 just as good?
The 3.8 is definitely the choice if you are looking for reliability. Change the lower intake manifold gaskets to the latest design and you are good to go. Regular maintenance should get you well over 200,000 miles. My Bonneville with the 3.8 is at 220,000 miles.
Another vote for the 3.8L, change the LIM gaskets as mentioned, and perform regular maintenance, and you should have a long lasting engine.
I am at 135K and going, and plan to get at least 250k or so out of it, maybe more if I can get the transmission rebuilt.