Editing Buick V6 engine (section)

=== Series III ===
The ''Series III'' engines include many changes. The upper and lower [[intake manifold]] is now aluminum on the naturally aspirated models. Intake ports are mildy enlarged; {{cvt|1.83|in|1}} intake valves (instead of {{cvt|1.8|in|1}} as on Series II) and {{cvt|1.52|in|1}} exhaust valves were introduced in 2003 engines, just before switching to Series III. [[Electronic throttle control]] is added to all versions, as is returnless [[fuel injection]]. Stronger powdered metal sinter forged connecting rods are used in 2004+ supercharged, and 2005+ naturally aspirated engines, instead of the cast iron style from Series II engines. Emissions are also reduced.

Also note that Series III engines are the base for any 3800 produced for the 2004 year and up. This means the same block, heads, and connecting rods apply to any remaining Series II engines made after 2004 also. The difference is that Series III engines received the new superchargers (Generation 5 – Eaton M90 – if equipped), intake manifolds, fuel systems, powdered connecting rods, as well as larger intake valves, drive by wire throttle body and electronics.

==== L26 SIII Naturally Aspirated ====
[[Image:3800SeriesIII 02.jpg|thumb|L26 engine in a [[Pontiac Grand Prix]]]]
The ''L26'' is the ''Series III'' version of the 3800. It is still a {{cvt|231|cuin|L|1|order=flip}} design. Compression remains at 9.4:1 as with the L36, but the aluminum upper and lower intake (2004+) and stronger connecting rods (2005+) are the primary physical changes. The powdered metal connecting rods were meant to be introduced in 2004 along with the L32, but the GM plant in Bay City, Michigan that supplies the Flint, Michigan plant could not achieve the desired production dates in time for that engine year.

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* 2004–2008 [[Pontiac Grand Prix#2004|Pontiac Grand Prix]]
* 2005–2009 [[Buick LaCrosse#First generation (2005)|Buick LaCrosse/Allure]]
* 2006–2008 [[Buick Lucerne]]
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==== L32 SIII Supercharged ====
The ''L32'' is a [[supercharged]] ''Series III''.
Introduced in 2004, the main differences between the L67 and the L32 are the L32's electronic throttle control, slightly improved cylinder head design, and updated Eaton supercharger, the Generation 5 M90. Power output is up to {{cvt|260|hp|kW|0}} in the Grand Prix GTP.

As with the L67, premium fuel (91 octane or higher) is required, but the PCM can compensate for lower octane fuel at the cost of lower power output. The use of below 87 octane fuel can cause detonation that eventually leads to engine damage and failure.

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|title      = '''Applications''':
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* 2004–2005 [[Pontiac Grand Prix#2004|Pontiac Grand Prix]] GTP
* 2006–2007 [[Pontiac Grand Prix#2004|Pontiac Grand Prix]] GT
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