Csc?

vtec to vvel

So a csc issue or something else? I figured if it’s a csc issue, I wouldn’t have been able to drive normally?


She is a ‘13 with 40k miles. After looking at carfax service records, looks like the tranny was replaced at 20k miles and clutch master cylinder replaced at 25k miles.

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justin_boy

what made them replace the tranny at 20k?

vtec to vvel

Do I have to drain the old fluid or can I just top off with dot4? I read dot3 and 4 are compatible. I get dot4 has a higher boiling point, but what would putting dot4 do?

Doesn’t say. I’m assuming it’s for the csc.

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JARblue

Worst case, CSC failure spits clutch fluid all over the clutch plate requires new clutch and flywheel in addition to a new CSC. Transmission replacement would not be warranted for CSC failure; it was likely something much more serious that necessitated the replacement. I sure as hell would have wanted to know what the issue was before even purchasing the vehicle.

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viiv

My theory is that once the fluid boils the first time, it is able to easily get 'around' and breach the seals of the CSC. Note, I have never held a CSC in my hand, just mentally guessing how it's built in my head.

Once the seals are breached the first time, assuming you don't have a catastrophic failure right there, right then, the seals are now significantly weakened and the CSC is on borrowed time.

I had the dealer replace the factory fill DOT 3 fluid on my 2020 with Motul RBF600 before driving off the lot.

We will see if the car having only ever been driven with RBF600 since new along with an annual RBF 600 fluid flush (summer driven car only) keeps the CSC in good condition.