My 91 300e has about 250k miles on it. Has had synthetic in it since 130k miles and was always serviced every 30k miles.

It continues to work well.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)