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The Buick 3800 V6 Does Not Have a Timing Belt.Has timing chain.
The 3.1 litre V6 engine in a 1997 Buick Century has a timing CHAIN
The 3.1 liter V6 in a 2003 Buick Century has a timing CHAIN
The 3.8 litre V6 engine in a 1992 Buick LeSabre has a timing CHAIN
chain
The 3.1 litre V6 engine in a 2003 Buick Century has a timing CHAIN
In a 1993 Buick Regal : Both the 3.1 and 3.8 litre V6 engines have a timing CHAIN
It has a chain.
The 3800 V6 has a timing chain.
Very likely
AnswerHow to replace starter for 1996 Buick Regal #.8 Liter 6cyl
Maybe oil passage leak by gasket in timing cover