I doubt Diseasel300 made the novice mistake of not cleaning it out first.

Other novice mistakes:

1. Break loose a fastener by applying steady torque. Don't do that! You want to impact the breaker bar with your palm or a mallet.

2. Having the Allen bit off center.

I have stripped my share of Allen heads even taking all the precautions. They are just an old and inferior design. I got the stripped Allens out by hammering and forcing an XZN bit into the Allen and got them out every time. I think it works better than Easy Outs (I do not own any).

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked