Actually, you can have quite a bit of variance between DOT 4 fluids. They don't actually regulate what the fluid is made out of, just that it meets certain requirements when tested. Castrol GT LMA is supposed to be easier on the type of rubber that Girling uses for seals in it's master cylinders and calipers. I haven't done any sort of testing on that, but I've known enough British car owners who refuse to use anything else due to problems that they've had, that I'm not going to argue. Plus, the LMA in the name stands for Low Moisture Absorbtion. The Castrol fluid tends to absorb less water than almost any other fluid out there. This means that it should cause a lot less rust on the interior of your braking system. >From a British Car FAQ I found in a search: "2. Why can?t I use generic brake fluid in my British car? British brake & clutch systems use natural rubber components which are only compatible with vegetable based brake fluid. American brake & clutch systems use synthetic rubber components which are only compatible with mineral based brake fluid. The only vegetable based brake fluid commonly available in the US is CASTROL GT LMA. Use of improper fluids or mixing of fluids can lead to complete failure of brake and clutch hydraulics. Use of any fluid other than CASTROL GT LMA violates all warranty on brake/hydraulic parts" You can buy Castrol GT LMA here: http://www.pegasusautoracing.com/ Plus, I'm sure that many other online suppliers handle it. I know Pep Boys has a better price at their stores than Pegasus has online, but if you can't find it locally, then you may have to go for it. Here is an interesting link on Castrol GT LMA and British cars. http://www.importautoberdoo.com/brake.html Mark N VIN 6820 At 04:08 PM 3/12/2003 -0800, you wrote: > Well, I've went to all the local parts stores and no one has any castrol. I asked the guy >at napa if he could order some for me so he looked and said that they don't have it listed. He >then asked me why it has to be castrol dot 4 and not any other dot 4. I said good question and >I'll find out. So why does it have to be Castrol? He said that the fluid is so regulated that there >really can't be much difference between all of the brands. So what is so special about it? > > Thanks in advance....again.....................Jason #5903 >