What plugs are correct???

[Barry L. Siple]

I own a 150hp HPDI and wondered what is the correct spark plug for my engine(Z150TXRZ serial # 6G4-X-852271). The manual tells me one thing and the sticker under cowl says something different. At this point I have been using BKR6EKU the plug listed under the cowl.

[boats.net]

Serial 851536 and up use BKR6EK-U1 Plugs.