Gregg, With that year of a car and the miles, I personnally with stick with an non-synth trans fluid, I don't believe a synth fluid would improve anything, but may cause problems. I'm sure Mercedes does not approve a synth for your transmission. If you decide to use Red Line call their technical help center, I would guess they would tell you to change fluid/filter, then change again in a few thousands miles. But again my thoughts would be stay with the MB fluid approved. timreid

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timreid
1992 400E
euro lights
500E sway bars
210 16in wheels