Hi!

Here's another awkward topic.

It’s time to service the old Bentley.
I decided to replace the spark plugs, but ran into a problem.

The official service center quoted $100 per each spark plug and refused to tell me the part number.
According to Google, the correct part number might be 101905600B.

So I started looking for alternatives — and that's where the real confusion began.
Some people say that NGK PFR6Q spark plugs are suitable.
Others claim that only NGK PZFR6Q-11 should be used (these reportedly began to be installed in cars from 2007, but are compatible with all models from 2003; they are also longer than the PFR6Q).
Meanwhile, the official NGK catalog suggests NGK PZFR6J-11.

So here's my question:
What spark plugs have you used in your Bentley, and how did they perform?

Thank you!

 

Brisk DOR14LGS. Around $15 each and a very noticeable improvement over fresh OEM plugs. Back in the day when we used Brisk ZC-series plugs in saloon car racing the typical improvement was 3-4% in dyno-confirmed BHP and slight improvement in fuel efficiency over the best performing conventional plugs. Highly recommended.