Small change, big difference

[alpina]

Just as an experiment, today I changed the spark plugs to NGK BP5ES.  Up until now I have been using the NGK BP6ES. Everything ran fine, with the plugs showing the ideal light tan colour, no fouling, so all good.  However after reading numerous recommendations on here by Dan (Benz Dr) and others about NGK BP5ES, it was always in the back of my mind to give Them a try.
Initially I was a little apprehensive on using a hotter plug when  the BP6ES were the ideal colour.

Well, all I can say is I should have done this ages ago. I never would have thought going up one heat range would make such a difference.
The car runs much smoother. That’s not to say it was running badly before, it ran great, but with the NGK BP5ES has just made everything that much better.  The BP6ES that I took out were only 1800km old. So it is not as if the BP6ES were worn.

Thank you Benz Dr.  So to anyone thinking about spark plugs I 100% agree with Dan NGK BP5ES is the spark plug of Choice.
If you are interested I have them gapped at 0.9mm. I also run a 1-2-3 Distributor, Bosch Red Coil, and bypassed Ballast resistor.

DM

[teahead]

https://www.amazon.com/gp/product/B001P9F0RI/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

[Tyler S]

Just a little NGK reading info.
https://www.ngk.com/learning-center/article/207/what-is-a-spark-plugs-heat-range

[Jordan]

Just as an experiment, today I changed the spark plugs to NGK BP5ES.  Up until now I have been using the NGK BP6ES. Everything ran fine, with the plugs showing the ideal light tan colour, no fouling, so all good.  However after reading numerous recommendations on here by Dan (Benz Dr) and others about NGK BP5ES, it was always in the back of my mind to give Them a try.
Initially I was a little apprehensive on using a hotter plug when  the BP6ES were the ideal colour.

Well, all I can say is I should have done this ages ago. I never would have thought going up one heat range would make such a difference.
The car runs much smoother. That’s not to say it was running badly before, it ran great, but with the NGK BP5ES has just made everything that much better.  The BP6ES that I took out were only 1800km old. So it is not as if the BP6ES were worn.

Thank you Benz Dr.  So to anyone thinking about spark plugs I 100% agree with Dan NGK BP5ES is the spark plug of Choice.
If you are interested I have them gapped at 0.9mm. I also run a 1-2-3 Distributor, Bosch Red Coil, and bypassed Ballast resistor.

DM

DM, thanks for sharing.  Always good to hear what works and what works better for our cars.  I am also running BP5ES but with a Pertronix . 

[ja17]

I have a 2002 Mercedes SLK 32 AMG since showroom new. It now has 38,000 miles on it and I decided to change the spark plugs for the very first time since it left the factory. When I removed the first spark plug it had a nice blue Mercedes Logo (star) on one side, on the other side in big bold lettering it read "NGK".  So now the purists in the crowd can be assured that these Japanese spark plugs are up-to the task!

[Mike K]

Thanks for the feedback, and good to see I'm not the only one. I changed to NGK BP5ES about 5 years ago and its made such a big difference to the way the car runs. I'm using these with a 123 Ignition.

I've recently done the same on my 1989 R107 300SL, replaced the Beru plugs that came with the car, with NGK BP5EFS, it's also made a world of difference.

Best,
Mike