Kreen is about a 1/3 stronger than BG-109, and that much faster. It is very effective. But you will have to stay on top of your filter changes as it can loosen stuff fairly quickly.
I would have no problem using a Kreen, except we can longer get it shipped into the Kalifornia Kollective
It's so strong that the State has deemed it too good for mere mortals to have access to
If you can order it in your area and are willing to insert a new filter every 500 miles or so, that's certainly one option
As I understand it, this vehicle uses a cartridge filter ? If so, by the time you pull the first one after treatment with either Kreen or BG-109, you will have a good idea of how often you will need to pull the next ones. Just from personal experience, I feel fine about using BG-109 and letting a filter bigger then say a Fram 3600 go 1,000 miles.
With Kreen, I'd pull the first filter inspection at 500 miles ... If it's not covered in slime and guk, you can let the next one go longer ...