I ticked on "No I'm unsure about its reliability". Other factors that may come into play:-

1) Most diesel powered vehicles are in the higher priced bracket, not many choices.

2) Price of diesel close to RON95, not too much of a difference

3) I notice usually there are more spills at the floor of diesel pumps, overall slightly less clean than petrol pumps. Since most diesel users are large trucks and lorries.

4) Occassionally there are quotas for diesel usage at petrol stations. Sometimes diesel are unavailable. Limited to RM50 per vehicle.

Yes, sometimes there are queues, especially by large trucks or lorries if the petrol station is on a highway.