That's what the label says.

I know DOT 4 is good. I know synthetic brake fluid is bad (not compatable)

I'm confused

Can anybody un-confuse me?

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5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots)
5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others)
5 speed '01 Jetta V6 (new wifes car, pretty quick)
5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k )
5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest)
0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it)

Synthetic fluid has longer life and is less prone to breakdown, flush total system and then add the fluid. I use Castrol synthetic DOT 4 and it has never let me down.

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99 Gurkha with OM616 IDI turbo

2015 Gurkha with OM616 DI turbo

2014 Rexton W with OM612 VGT

Like synthetic vs. dino oil, you either use one or the other. Like Gurkha said, flush the current fluid out before performing the transfusion...

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car

I won't use anything other than Castrol LMA or MB brake fluid.

I tried DOT 4 synthetic once, and it left me with a spongy brake pedal. The local mcparts store doesn't carry it anymore due to the high number of complaints.

Funny you should say that, that's my problem. I've always used it but the new bottles say Castrol GTLMA Synthetic Brake Fluid , DOT 3 and DOT 4.

I think DOT 5 (the silicone stuff) is the fluid spec to stay away from. DOT 4 synthetic should be okay - I used it in my 300E and it worked great.

TonyB is right.

AND you have to replace EVERY rubber part in the system...First.

AND you have to "FLUSH" the system with Brake Cleaner...First.

BUT I would not attempt to "Flush" an ABS unit with Brake Cleaner , So I
think you're out of luck as far as DOT 5 is concerned.

DOT3 OR DOT4 are both fine...

"Mushy" pedal is air.

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'84 300SD sold
124.128