All Castrol SRF the same?

[bigjae1976]

Originally Posted by ayao

Just some food for thought:
http://www.1addicts.com/forums/showt...php?p=10494908

Interesting. Is there that much of a difference between RBF600 and RBF660?

[M3PO]

Originally Posted by ayao

Just some food for thought:
http://www.1addicts.com/forums/showt...php?p=10494908

Well, that sure does muddy the waters a bit lol!

It does say in there (presumably from Castrol themselves) that you can mix SRF with regular fluid so that's good. That makes a flush of the old OEM stuff easier.

I think I'll be fine with any of them. I'm just getting started.

[aus]

IMO, if you're boiling these high end fluids, you need better brakes or are over driving the car.

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[Z K]

Originally Posted by aus

Looks like Mu dry is 335 and wet is 221. http://project-mu.co.jp/en/products/other_fluid.html
Castrol SRF dry is 310 and wet is 270. http://www.castrol.com/liveassets/bp...s/SRF_B768.pdf


It's the wet boiling point that really matters since that's what will affect your pedal feel. Mu is a little cheaper.

It's too bad LeMans_Blue isn't here anymore. He'd give a NICE summary about brake fluid.

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Yeah, I like how Project Mu is cheaper than SRF. It has a higher wet boiling point than Motul RBF600 for about the same price. I can't justify the SRF price.

I used to burn RBF600 brake fluid regularly on my old Evo on track so the Project Mu was a good upgrade. Those cars are much harder on brakes than the M3. The factory Brembos are way undersized for the application.

Edit: Looks like Project Mu G-Four's price is now higher. It used to be about $30-40 for a liter. At the current price, SRF is the better deal.

[bigjae1976]

Originally Posted by aus

IMO, if you're boiling these high end fluids, you need better brakes or are over driving the car.

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Good point. I think you have to manage the brakes in the E9X M3 even with good track pads. I've never ran into brake fluid overheating issues unless my pads were getting low. Then its much easier to boil the fluid. I have titanium backing plates which help tremendously at preventing that.