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02-22-2011, 06:34 AM | #23 | ||
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I wrote Mike Miller of Bimmer Mag...might be useful...
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03-09-2011, 04:33 PM | #24 |
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I have tried to have the oil in my Transmission a couple of times. Even with the proper computer only about 3.5 l of oil was changed. Most of the oil is located in the cooling lines, radiator and upper parts of the transmission that are not accessable when you drop the oil. So my specialized repair facility has not been able to source any information on changing all the oil even at the proper temperature and equipment.
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03-11-2011, 01:48 AM | #25 |
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So just change it again in a few thousand miles. It's pretty common with traditional auto tranny's to only get about 1/3 of the oil out each change.
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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04-04-2011, 05:46 PM | #26 |
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Update - swapped my fluid:
I found an independent BMW shop to swap my M-DCT fluid. Rumor has it that the units total dry capacity is ~9.5l. They were only about to get between 4-5l out of mine and they claimed they used the computer to cycle the pumps in the transmission (no idea if they actually did). My plan is to swap again in 10k miles or so. Those swaps together will remove about 75% of the total contamination. The proper fluid was not at all tough for them to locate. They also said the fluid that came out looked practically new. Since all it does is bathe the gears that is not too surprising. Sure wish there was a way to get all of the fluid out. That might also require some priming of the various hydraulic systems in the unit, however that capability must be somehow built in. Job took less than 1 hour and I was charged 1 hour of labor.
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04-05-2011, 05:59 PM | #27 |
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I could bet my house that rumor is wrong man . You'd have all gears submerged in fluid if that was the case. The Getrag M3 manual tranny only holds 2-1/4 after draining it bone dry. The DCT unit is about the same size, and does NOT have a converter, so when fluid doesn't drain out anymore, it's empty as well. And if shop cycled the pump, it pretty much got out everything, although there's very little fluid in the lines and cooler anyway.
I'm sure if you post on the tech section the acutal capacity of the DCT from the service manual, a tech should respond quickly. Even 5L is a lot, so I don't expect any more than that. I'd wait until 20K or so, since that fluid is not cheap, but you did the right thing; fluid is a lot cheaper than a new transmission (or a rebuilt one). By changing it frequently, there's no need to get every drop out IMO, since fluid is still relatively fresh. Cheap insurance. And remember DCTs contaminate fluid with clutch wear, so color alone is not a determining factor of oil condition. You should have taken a sample to have a better idea where you stand. Take care. |
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04-05-2011, 06:03 PM | #28 |
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I want to say the capacity on the evo DC-SST (dual cutch trans) is something like 8qts. That's a getrag unit also.
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04-05-2011, 11:02 PM | #29 | |
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04-06-2011, 12:30 AM | #30 |
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^ Read this entire thread. There is this advised "warm refilling" procedure.
Every 10k miles is way too conservative/wasteful/expensive for tranny fluid, DCT or not.
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04-06-2011, 12:34 AM | #31 | |
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Could or would?
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Thought about that but it only would have been more cost, no surprises and nothing that could be done if it indicated a big problem. BMW wouldn't do squat.
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04-06-2011, 12:51 AM | #32 | |
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mods: track ready stuff
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04-07-2011, 12:54 AM | #33 |
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I was referring to send it to Blackstone (or other) lab, so you don't change the oil excessively early, due to the high cost of DCT oil. Was just trying to help . Good luck.
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04-07-2011, 01:17 AM | #34 |
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I think a conservative figure for tranny fluid swap without track use is about 30k. A more reasonable figure is probably 60k. With that much track use I might go with once a year after your season. These are very rough numbers. Check out something like Porsche GT3 MT fluid change intervals just for reference. I'm not saying the trannies are similar but that will be an example of a high performance (and typically run hard) MT. A DCT is basically a MT on the inside.
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04-07-2011, 01:18 AM | #35 |
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No, it is good advise. No offense. When it is off warranty I will consider Blackstone analysis. Cheers.
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04-11-2011, 09:27 AM | #36 | |
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mods: track ready stuff
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06-08-2011, 08:02 PM | #37 |
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55K & 20 track days 2008 M3 DCT
Hi All,
Advance driver - strong track days - heated up in 110 degree weather three times - still no problems. Am thinking about changing - Dealer says $45 per quart - 7.5 quarts & 2 hours with a BMW module that activates the pump during the change process Michael |
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06-08-2011, 11:43 PM | #38 |
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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08-30-2011, 11:44 AM | #39 |
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Swamp2,
what shop in SD did you go to for your DCT fluid change? Thanks in advance..
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02-16-2012, 11:19 PM | #40 |
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Here are the DCT fluids. Chaning mine this weekend. BTW for some reason my supplier quoted me a lower price per liter for the 1L small bottles compared to the 20L version.
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02-18-2012, 06:46 PM | #41 |
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What did it cost per liter? Did you buy it locally or over the internet? When you finish changing the fluid, can you please give a brief write up? I am curious if this is something that can be completed at home or if it requires a GT1 computer to cycle the pumps. Thanks.
Last edited by MiamiM3; 02-18-2012 at 07:29 PM.. |
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02-21-2012, 07:58 PM | #42 |
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Any update on this?
How much did you get out? What was the process?
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03-05-2012, 06:43 AM | #43 |
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Does anyone know if there's a write-up somewhere that would show a comparison between a conventional automatic transmission versus the DCT regarding the friction elements and 'slip' as the clutches engage?
I'm wondering if the OEM is recommending against changing the DCT fluid because of the significantly decreased friction element wear due to the nature of the design of the DCT. If say, the DCT friction elements wear at 5-10% of the rate of a conventional automatic tranny, perhaps this would correlate to that much of an extension of fluid life? In any case, those who track their cars are definitely asking more of the DCT than those who don't, so I think it would be interesting to see how much of a difference there is in the particulate matter of the fluid removed from a car that's been tracked 15-20x per year versus one that hasn't been tracked at all with equivalent mileage on the tranny.
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03-05-2012, 07:46 AM | #44 |
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I used this DIY on my other M3...Mazda 3...auto tranny. It worked fast and I got to completely flush the tranny fluid.
http://krystmsgarage.com/?p=250 I wonder if the pump on the DCT is accessible and you are able to remove the hoses like the DIY above. Then maybe you could use the DCT pump to drain the old fluid while pumping in new fluid. So the transmission never goes dry and you should be able to do a complete flush.
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