Mini recommends replacing the spark plugs at 30k intervals. Does anybody replace them sooner as 20K for better MPG? I am asking because I am a believer in preventive maintenance.

Also, what is the expected life of a battery........ It has been replaced 2 years ago.

 

My 2014 Coupe's battery quit holding a charge before the warranty ran out. But I never replaced the battery on my 2007 MCS and it was 7 years old when I traded it in.

 

While it may be overkill at this point, I like to change my spark plugs every 15K. No rhyme or reason whatsoever as this is just a personal preference. As for the battery, I have the OG unit from 2009 and its still going strong. I do however put it on a trickle charger whenever i am out of town. My two pennies.. lol

 

In the last 10 years we have purchased 4 new domestic vehicles none of which have spark plug replacement required before 75k miles. 3 of these cars have, or had, turbo chargers. Why does the Mini go thru plugs so fast....and coils too?

 

The JCW engine maintenance states plugs need to be change at 30K intervals. It is probably because that specific engine has larger valves, pistons and turbo than the regular S engine which I believe is 100K.

As for coils, I never heard they need to be replaced.

 

The only bigger that JCW have is the turbo and for being more specific the compressor wheel..
Valves-pistons etc etc are all the same.!

 

This is not true. Knowledgeable experts have explained on this forum many times and with details what are the differences between the S and JCW engines.