G.A.S. BMW M54 CCV System Frequently Asked Questions


Everything you ever wanted to know about the German Auto Solutions CCV System.

Does the G.A.S. CCV replacement System come with everything I need to install it?

Yes. All the components and hardware are included. The kit also includes spares of critical hardware and o-rings in case something is lost or damaged during servicing the CCV. This way you won't be left without a vehicle while waiting for spare parts.

Does the G.A.S. CCV System replace all of the failure prone plastic hoses used by the stock BMW CCV?

Yes. The two plastic upper hoses are replaced by a solid aluminum manifold and the lower drain hose is replaced by a larger and very high quality reinforced rubber hose.

Is the G.A.S. CCV System hard to install?

The system can be installed with or without removing the intake manifold from the engine. If you don't remove the intake manifold I would put the difficulty factor at 5 on a 1-10 scale. If you do choose to remove the intake manifold the job would be about the same as replacing the OEM BMW CCV and I would raise the difficulty factor up to a 7.

If I decide not to remove the stock CCV from under the intake manifold when I install the my new G.A.S. CCV will the old CCV still be connected and cause problems?

No. Even if you do not physically remove the old BMW CCV from the bottom of the intake manifold it WILL NOT remain connected in the system in any way. The only draw back to leaving it in place is the few extra ounces of useless weight you will be hauling around.

How long does it take to service the CCV during an oil change?

Removing the CCV Vacuum regulator and oil separator adds about 15-30 seconds compared to removing the stock oil filter cap. Cleaning the oil separator by rinsing it out with aerosol brake cleaner adds another approximately 3-5 minutes.

What if I have my oil changed by a service shop, how will they know how to remove and clean the CCV?

The G.A.S. CCV System will included a laminated glove box sized instruction sheet that you can give to your service technician.

Can the G.A.S. CCV fail in a way that could hydro-lock the engine and cause severe damage like the OEM BMW CCV system?

No. With the OEM BMW CCV if the plastic tube between the CCV and valve cover failed, vacuum would get applied solely to the oil sump drain back hose, which would cause oil to be sucked out of the oil pan and directly into the intake manifold which could result in hydro-lock. With the G.A.S. CCV system that plastic hose is replaced by a two inch long solid aluminum manifold. It cannot fail in the same way as the OEM system.

Will the G.A.S. CCV System cure my excessive oil consumption problem?

Yes and no. The G.A.S. CCV will remove more oil from the engines blowby gasses than even a brand new BMW CCV unit. To the extent that your oil consumption is caused by a failed stock CCV, the G.A.S. CCV will eliminate that consumption. The G.A.S. CCV is not a cure for worn valve seals and piston rings. The amount of oil consumption reduction will be vehicle dependant.

Are replacement parts available for the G.A.S. CCV if something needs to be replaced sometime in the future?

Yes. All the CCV components will be available as replacements parts. The only wearable components in the system are o-rings and the silicone vacuum diaphragm. These should last a long time and are inexpensive to replace.

The OEM BMW CCV causes lots of problems in cold weather because of moisture freezing up in the vacuum regulator and drain back path. Will the G.A.S. CCV be better in cold climates?

Yes. The G.A.S. CCV will be MUCH better in cold climates. Unlike the OEM CCV, the G.A.S. CCV body is heated by engine oil. This means that once the engine and CCV are up to temperature all of the moisture in the CCV that comes from starting an engine in cold weather will get evaporated off and only the recovered oil will be left to drain back to the engine sump.

Will it be a problem if I live in a very cold climate where temperatures remain well below freezing for days or weeks at a time and my driving consists of mostly short trips?

It can be. Depending on ambient temperature the engine my need to be run as long as half hour or more to get the oil separator hot enough for a long enough period of time to evaporate off all of the moisture. If you take several short trips in a row in very cold weather it's a good idea to take a longer drive or leave the car idling for 15-20 minutes after a short trip. We will be making and selling an optional form fitted molded foam "Cozy" to slip over the CCV to prevent the cold air that flows over the CCV housing from lowering its operating temperature. This would be for very cold climates only.

I see the G.A.S. CCV still retains the drain back hose to the oil pan like the OEM BMW unit. What keeps the G.A.S. CCV drain back hose from clogging up like the stock BMW one?

Several things actually. First, the G.A.S. CCV does a better job of removing the carbon based crud from the blowby gases and trapping it in the oil separator where it gets washed out as part of your oil change procedure instead of ending up in the drain back hose. Second, the extra volume of clean oil that gets removed from the blowby gases by the secondary oil separator helps to wash down the inside of the hose. Third, the gooey white emulsified sludge that can clog up the hose in cold weather with the stock CCV doesn't happen with the G.A.S. CCV because it runs at engine temperature which turns the sludge back into oil. Forth, the drain back hose can be washed down with aerosol brake cleaner to rinse out any accumulation in the hose, including the 90 degree bend at the dipstick tube.

I have a supercharged M54. Will the G.A.S. CCV Kit work with forced induction?

Not the current version. If there is enough interest we will make a forced induction option. The design parameters have already been worked out and it's very doable.

I've seen forum post suggesting I can replace my BMW CCV with a $5.00 PCV valve and a couple of hoses. Can I?

You can in the same way that you can replace your brakes with a water pump. Both your brakes and your water pump serve an important purpose but a water pump won't stop your car and a set of brakes won't circulate your coolant. The BMW CCV system and other manufacturers PCV systems work in completely different ways. The BMW CCV regulates pressure in a closed crankcase and a PCV valve regulates flow in an open crankcase.

If you replace the BMW CCV with a PCV valve it will always be operating in one of two modes. When the total quantity of blowby gases generated by the engine is less than the flow regulation rate of the PCV valve, the crankcase vacuum will increase until dirty outside air starts getting sucked past the engines crankshaft seals. When the quantity of blowby gases generated by the engine is greater than the flow regulation rate of the PCV valve, crankcase pressure will build until either you blow a main seal or the valve cover. Both of these situations are obviously very bad for your engine and wallet. This is basic physics 101 as it relates to flow and pressure.

Coming soon will be a complete G.A.S. website page dedicated to an in depth discussion of CCV and PCV systems, the physics behind them, and what actually happens when you replace one type with the other.

Regarding the PCV valve question again, I've read that the high crankcase vacuum created by connecting a PCV valve to my BMW engine will reduce oil consumption. Is this true and how much vacuum will the G.A.S. CCV generate?

Possibly. There seems to be quite a bit of anecdotal evidence out there to suggest it's true. The problem is, as pointed out in the answer to the previous question, the full manifold vacuum provided by a PCV valve will exceed the sealing capabilities of the engines crankshaft seals, resulting in dirty air from underneath the vehicle getting sucked into the engine and probably completely destroying the seals in the long term.

The current version of the G.A.S. CCV generates 40-50% more vacuum than the OEM BMW unit (approx 0.8-1.0 inHg / 0.4-0.5 PSI), but far, far less than the full manifold vacuum provided by a PCV valve (up to 20 inHg - 9.8 PSI). Our testing shows that the seals start to leak somewhere around 10 inHg - 5 PSI of vacuum. Based on this information we will be experimenting with an optional vacuum regulator modification to raise the crankcase vacuum from the current 1.0 inHg - 0.5 PSI to maybe around 5.0 inHg - 2.5 PSI. Hopefully this will provide an even greater reduction in oil consumption without the risk of damaging your engine like a PCV valve system.

Since BMW designed the system around a crankcase vacuum of 0.4-0.7 inHg of vacuum, we will be offering the "High Vacuum" modification as a "Use at your own risk" option.

Will the G.A.S. CCV system be available in a black anodized finish like what's shown in the CAD models?

That was the original intent but there ended up being a couple problems with that idea. First, all the pockets and passages in the oil separator and vacuum regulator cause air pockets which would prevent those two parts from being able to be run through a commercial anodizing line. Second, is the cost. The number of parts in the system would probably add another $50.00 to the cost of the CCV kit. There is a possible future option if there is enough customer interest. We could anodize the two problematic parts in house where we can minimize the problem of air pockets and send the other parts out to a commercial anodizer since we can't handle the total volume of all the parts in house. The black anodized finish could then be offered as an option for those willing to pay for it.

Does the G.A.S. CCV have a warranty?

Yes. The G.A.S. CCV has a 5 year warranty on everything but the o-rings. Since o-rings can be damaged by mishandling them during cleaning we warranty them for 1 year. Individual o-rings and complete kits will be available at low cost.