Bosch FR78X super plugs

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Got a stonking deal on some spark plugs, Bosch FR78X Super plugs, knowing my GS is likely due a change soon, so took a punt. 

Got quoted over £80 from the garage just to change the plugs last year, and seeing it shouldn't be  a terribly difficult job, decided this might be the cost effective route.


Anyone had any experience of these plugs in a Mk2 GS300?


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