3.8 vs 4.6 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-15-2012, 10:21 PM   #1
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Default 3.8 vs 4.6

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?
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Old 10-15-2012, 10:32 PM   #2
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I heard the N* engines have issues with head gaskets. IMO, I'd rather do the LIM gaskets on a L36 or L67 3800 5 times a day then a N*.
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Old 10-15-2012, 10:37 PM   #3
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For reliability, I would take the 3.8
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Old 10-16-2012, 07:29 AM   #4
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x3 3800 aside from the intake manifold the one time mine has never had to be messed with
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Old 10-16-2012, 09:28 AM   #5
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3800 is the way to go if you want long lasting and easy to maintain.
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Old 10-16-2012, 12:52 PM   #6
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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.
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Old 10-21-2012, 01:24 AM   #7
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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.
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