I'm going to be changing my '89 420SEL's brake fluid in the next few weeks and am curious as to whether it makes much difference which DOT4-rated fluid I use. I picked-up a quart of Valvoline's SynPower fluid at the local AutoZone last weekend, but thought I'd check with you guys before I used it...

(I understand that dry and wet boiling points vary from brand to brand, but am I correct in assuming that as long as the product meets the DOT4 standard, it'll do the trick--assuming typical local and highway driving?)

Thanks, as always, for sharing any insights.

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Eric

1991 560SEL-Euro (214,000 miles)
1989 420SEL (Retired from daily use at 325,000 miles; Use as donor vehicle)