Can Bell Hammer 7, Phantom, and Light be mixed? What are the shelf lives for opened and unopened bottles? Can they be used with other additives like WAKO’S e-Clean Plus? Should it be added at every 5,000 km oil change?

Mixing Bell Hammer 7, Phantom, and Light will not cause engine trouble, but it may reduce each product’s intended performance.
Since their formulations and purposes differ, it’s best to choose one according to your specific application.

The approximate storage life is about 5 years unopened from the date of manufacture.
Once opened, tightly close the cap and store in a cool, dark place, and aim to use it within 1 year.

Concurrent use with additives from other manufacturers is not recommended, as differing chemical compositions may cause separation, sedimentation, or reduced performance.
If you wish to compare effects, use one additive per oil cycle.

Adding the product at every oil change is ideal.
The Bell Hammer additives bond with the oil to form a lubricating film, but the additive components are discharged when the oil is replaced.
Regular use at each change ensures consistent lubrication and protection performance.