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Join Date: Nov 2005
Location: Stuttgart, Germany
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Porsche Crest Dot 5 Brake Fluid or Not?

2006 997 C4S 45,000 miles. Is Dot 5 brake fluid (the blue stuff) bad for the seals in this car? Have heard conflicting stories. I change the fluid at the end of summer and in the spring after sitting all winter.

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Mordaunt P. Brabner
2006 997 C4S
Old 04-18-2012, 06:28 PM
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Do not use DOT 5 brake fluid, these cars were not designed to use it. Use DOT 4 such as ATE Blue or ATE 200.
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Old 04-19-2012, 03:09 AM
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Well said,

Thanks for the info. Is there a source document I can reference?

Platt

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Mordaunt P. Brabner
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Old 04-19-2012, 03:48 AM
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This has always been confusing. Dot 5 (purple color) is silicone and does not mix with the other brake fluids. Dot 5.1 is the same as Dot 200 or Dot 4 Super and is all the same.
Old 04-19-2012, 06:17 AM
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Originally Posted by 997 C4S View Post
Well said,

Thanks for the info. Is there a source document I can reference?

Platt

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Probably the best source is the OEM service manuals (online only via subscription), which spec Dot 4 fluids. DOT 4 cars are not necessarily DOT 5 compatible. We have had a couple customer's try the DOT 5 silicone based fluid, which resulted in multiple seal failures and a very some large repair bills.
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Old 04-19-2012, 10:25 AM
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This has always been confusing. Dot 5 (purple color) is silicone and does not mix with the other brake fluids. Dot 5.1 is the same as Dot 200 or Dot 4 Super and is all the same.
And don't forget the SL 6 low viscosity fluids for cars with the ESP stability management electronic braking systems............
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