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The 2008 Suzuki SX4 has a 2.0 L base engine size.
The 2008 Suzuki SX4 has an inline 4 engine.
Any place that sells batteries can tell you the correct size battery for your Nissan.
The 2008 Suzuki Grand-Vitara has a 2.7 L base engine size.
The 2008 Suzuki Grand-Vitara has a V6 engine.
BCI group size ( 59 ) Originally equipped with Motorcraft BXT-59 battery ( 2008 Ford Taurus )
they are all 15"
51-R
Group Size 86
Anyplace that sells batteries can tell you the correct size to buy.
A "Group 42" battery
The difference is battery group size, name badges, and the sidekick has different options.