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It does not constitute any contractual term, representation or warranty.
As such, spark-plugs.co.uk takes no responsibility in respect of any
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Technical
Information
Choosing the correct spark plug
The single best way to ensure you are fitting the correct spark
plug or glow plug to your vehicle is to check what is currently installed.
Always replace with the same plug or the equivalent NGK spark plug
if you are currently using a non NGK spark plug. If you are experiencing
spark plug related difficulties or you notice damage/wear/fouling
other than normal wear (see Fault
Diagnosis) then you may need to consider using a different
spark plug type. If you need help with manufacturer parts cross reference
please contact
Engine Modifications
You may need to change the heat range of your plug (indicated by
the number in the middle of the NGK part code - e.g. BPR6ES
to BPR7ES) if certain aspects of your engine have been modified
to increase (or decrease) performance. A change of heat range is most
commonly needed when increasing the engine's compression ratio. If
the vehicle is turbo charged and has had a severe 'boost upgrade'
(the turbo wastegate vacuum lines have been manipulated to allow a
higher pressure to build up before release) you may also require a
colder grade spark plug.
Changing heat ranges
It should be noted that putting a colder grade (higher number=colder
grade, e.g. BPR5ES=hotter, BPR7ES=colder) of spark plug in an engine
which doesn't require a colder grade may cause difficult cold starting,
plug fouling and poor running at low revs. Using a hotter grade (lower
number=hotter grade) than is required may be the cause of overheating,
detonation and heat damage to both spark plug and combustion chamber
components.
