Leaded high octane gas?

[Jeffxxx]

Is this safe to run? I did a quick search and didn't get solid info.

I'm running the VF stage 2 supercharger.

[Jeffxxx]

Nevermind, sourced some unleaded. But for future reference can you run leaded?

[supersickbimmer]

Don't run unleaded if you have cats. Your O2 senors might go sooner as well.

[DLSJ5]

Don't run unleaded if you have cats. Your O2 senors might go sooner as well.

You mean don't run leaded! :)

Jeff, try some MS109. :thumbsup:

[Jeffxxx]

You mean don't run leaded! :)

Jeff, try some MS109. :thumbsup:


It's hard to find any fuel around my area, probably could find it in Seattle.

But this is what I acquired...

I guess it's a true 102 octane unleaded.

http://i57.photobucket.com/albums/g206/gameshot/IMG00050.jpg

Another question is how far should I run my tank down before I put this in, how noticeable of a difference is this going to make?

This is how low my gas is.

http://i57.photobucket.com/albums/g206/gameshot/IMG00049-2.jpg

[MSpired]

Don't run leaded at all if you are running cats. Also, running leaded can wear on your O2 sensors. I've read that our ECU can read and adjust timing for up to 104-105 octane, so try to go with a unleaded gas thats at least 105 MOTOR octane. From Drew's reviews and dyno's, looks like MS109 is one of the best unleaded out there :thumbsup:

Once the car reads 0 miles, you still have about a gallon left in the tank, try letting it hit 0, then driving for another 10 miles or so.

[metalmind1]

You would be fine to run laeaded gas in small amounts. If you do use it a bunch you run the risk of fouling your o2 sensors and clogging up your cats if you are still running them.

[Jeffxxx]

Don't run leaded at all if you are running cats. Also, running leaded can wear on your O2 sensors. I've read that our ECU can read and adjust timing for up to 104-105 octane, so try to go with a unleaded gas thats at least 105 MOTOR octane. From Drew's reviews and dyno's, looks like MS109 is one of the best unleaded out there :thumbsup:

Once the car reads 0 miles, you still have about a gallon left in the tank, try letting it hit 0, then driving for another 10 miles or so.


The stuff I got is 105 motor octane and I guess it's 102 true. Isn't the "miles left" display not accurate since we're running different injectors?

[MSpired]

The stuff I got is 105 motor octane and I guess it's 102 true. Isn't the "miles left" display not accurate since we're running different injectors?

Yes, but it keeps re-adjusting.

[Saintly]

109 is awesome stuff, although I run c16+ more often than 109

[Jeffxxx]

Well that ERC stuff is AWESOME. I actually enjoyed my kit last night.

[UrineMachine]

I use Sunoco 110 leaded

[Vlad90]

Would I be able to run phillips 110 race fuel in my car or would it destroy my engine. I have an 04 325ci.