[Jamo]

Fuel Safe and other mfgs will tell you whether your bladder can take the alcohol additives found in off the shelf octane boosters (that's how they reach the higher octanes rather than with real lead). Some can, but they are usually special order items, and if your bladder's been in there awhile (I presume it has), it likely is not designed for the alcohol ingredients (had one literally fall apart in my first Cobra). Typically, the alcohol-boosted stuff will say "lead substitute" on the can/bottle...but read the ingredients list. In addition, most bladders have a replacement date...most are around five years, but newer designs can go much longer.

Take the plate off and read the labeling on the top of the bladder (should be near the connections), and check with the mfg. My guess is that you either have a Fuel Safe or ATL.

REAL lead works fine, as does aviation/racing fuels.

Some folks have had problems with their state's ethenol mixed gas.