If the creaking sound goes away, you have identified which part needs to be replaced. You have not fixed anything. If you continue to lubricate the ball joint whenever it starts making noise, one day your lower control arm will separate from the steering knuckle and your wheel will appear to be coming off. At speed this is really inconvenient.

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88 300e
89 300e
93 400e
93 500e
77 308 GTB