Qoute fro Mr Ian Bose -Another very satisfied Liqui Moly user
" I received and used the diesel purge on my Yanmar engine last week.
The problem I was having is that after running the engine for an extended period the RPM would start dropping off in 15 second intervals from 3000rpm to 2000rpm where it would stay there for 3 seconds and then return to 3000rpm.
After using the diesel purge and on first use on Wednesday last, the problem seems to have been resolved. I will be testing again this Wednesday to confirm this. My mechanic had advised that I would need to remove and service the injector pump in order to solve this problem.
Update...I tested the engine again yeaterday (went fishing) and once again it worked perfectly proving that the liqui moly diesel purge worked.
Thanks for a great product.!"http://www.liqui-moly.de/liquimoly/medi ... ung_EN.pdf