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Old 09-22-2008, 10:26 PM
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Join Date: Jun 2000
Location: Saugus, CA USA
Posts: 2,035
Is DOT 4 Synthetic brake fluid OK?

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?

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)
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Old 09-22-2008, 11:03 PM
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Location: Boondocks
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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.
99 Gurkha with OM616 IDI turbo

2015 Gurkha with OM616 DI turbo

2014 Rexton W with OM612 VGT
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Old 09-23-2008, 04:59 AM
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Location: Dallas/Fort-Worth
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Like synthetic vs. dino oil, you either use one or the other. Like Gurkha said, flush the current fluid out before performing the transfusion...
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
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Old 09-23-2008, 06:41 AM
you bought what???
Join Date: Sep 2008
Posts: 5
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.
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Old 09-24-2008, 01:03 AM
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Join Date: Jun 2000
Location: Saugus, CA USA
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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.
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Old 09-24-2008, 01:04 AM
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Join Date: May 1999
Location: Sacramento, CA
Posts: 1,530
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.
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Old 09-24-2008, 01:30 AM
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Drone aspiring to Serfdom
Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
Posts: 5,554
DOT 5 IS the Silicone

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.

'84 300SD sold
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