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The XJ bit comes from the in house project codes

X - Experimental

J - Jaguar

6 - 6 cylinder

They just didnt rename it when they put it into production. The similar XJ12 has a, you guessed it, 12 cylinder engine.

The code name for the 86-94 model was XJ40, followed by X300, X308, X350, etc.

All of these were known as XJ`s though the 6 was dropped with the X300 as it had an 8 cylinder engine.

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13y ago

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