What's the best and cleanest gas out there?


Listen to my story...

We have 4 vehicles...
1. BMW R100 motorbike
2. Civic Esi
3. Lxi
4. Mitsubishi lancer Glx 1991

I don't use these vehicles frequently. They take turns depending on coding. Point is recently... I've been tanking in shell (Unleaded Gas). For some reason I felt like driving the mitsubishi more often for a month. Well guess what?

I tried starting the 3 vehicles that have not been used for only 1 month. ALL the three of them.. Sabay sabay. Stuck ung valve. It only stays open and won't close anymore due to some sticky black thing that prevents the valves from moving. So.. I removed the head of each vehicle.. Popped the valves and cleaned them out with "firefly" (seemed to really dissolve the black stuff better than the brake cleaner). Put em back in with new head gasket of course and readjusted the valve clearances a bit. Then tada.. All the vehicles started to run properly.... Put em back aside.... Next morning all of em won't start again. I did a big mistake and didn't drained the Shell Gas. But how come only now!? This is the first time this happened!

What are they putting in our gas these days? Is this because of the bio stuff and coconut essence or whatever that makes it this sticky? Did you guys have these problems as well?? I'd expect problems with the carburator but not on the valves!

So here I am repeating the entire steps again. Not wanting to make the same mistake again. I'd like to know who has knowledge about local gas in the Philippines and what they mix in their soup. Obviously the gas today is worse than the gas we had 10 years ago. This unknown substance is able to pass through the fuel filter. It's really weird. *confused*