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A bit late to the angel eye party: 2001 M5
134a is a gas when uncompressed and a liquid when compressed. You want to charge with the bottle upright so the charge is sucked in as a gas and not in liquid form, because dumping compressed liquid 134a into the low pressure line can slug (think hydrolock) the AC compressor.

Some bottles are a mix of gas/oil or gas/oil/stop leak. Stick with the straight 134a.

What was all over the ground was likely oil from the compressor, which is added separately in a 134a system during the initial charge. For a slow leak, it is unlikely you need to add oil back into the system.
Why do people just post what they are thinking? Without thinking.

2012 Ford Mustang
1995 BMW 540i/A
1990 Eagle Talon TSI AWD
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