What would cause the Passenger side rear tire to wear heavily
on the outside?

1991 300TE.

I would like to fix anything needed prior to taking
it to the indy for a 4 wheel alignment.

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project