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A hairline fracture in the expansion tank may be present, becoming apparent only when the engine is heated; I experienced this issue with my E46.

At the end of last year, I had to replace the radiator, and one of the additional components I needed was a new expansion tank lid due to the inner rubber seal being cracked and dehydrated. Interestingly, I replaced the petrol tank cap myself approximately two months ago for the same reason, and ultimately, it is down to general ageing and wear; hence, it is entirely plausible that you are experiencing leakage from that cap. I opted for the replacement OEM part from the dealer, priced at £26, to ensure the release pressure was accurately calibrated for my engine. It may be prudent to take a risk initially before engaging in further costly inquiry, and at the very least, it serves as an additional measure for future-proofing and preventative maintenance.

Consider replacing your expansion tank cap. My partner's B48 engine Mini and my previous 520d both experienced unexplained coolant loss, which was rectified by replacing the coolant cap. Although our rate of loss was significantly lower than yours, this may not be the issue unless your caps or seals are severely compromised.

It is primarily a matter of inspecting for dampness, as a gradual leak such as yours will not produce a puddle; the heat exchanger facilitates evaporation. However, you should see either desiccated coolant or a moist area. If the leak were into the gear oil, the gearbox would exhibit malfunctions.

Thank you. Is the sole method to eliminate that possibility to replace it?

https://www.realoem.com/bmw/enUS/showparts?id=VC32-EUR-06-2006-E90-BMW-320d&diagId=17_0315

The gearbox heat exchanger is known to lose coolant without exhibiting visible leaks.

Automatic

Automatic or manual.

I do perceive smoke, but it appears ordinary to me. Nothing superfluous? I have not rescanned it for codes. If the coolant were at full capacity, the tank would likely be entirely depleted by approximately one month after covering around 150 miles.

Is there any white smoke emanating from the exhaust, pollution present in the coolant, or any misfire codes detected? What is the amount you are adding?

I possess a 330D M Sport E90 and believe I have maintained it rather diligently. It has 140,000 miles and has undergone numerous preventative maintenance procedures in recent years. I observed a decrease in my engine coolant level, although there were no discernible leaks on the driveway. I had it pressure tested, and they verified that there were no exterior leaks. I presume this likely indicates a head gasket issue. If that is the case, then I am profoundly disheartened! What actions may I undertake to verify whether it is the head gasket?

Thank you for your assistance.

I would choose the CL55 AMG if it is available. The M113K engine is exceptional.

Thank you for the information; I am unperturbed by challenges as long as I own the necessary spare parts and equipment. I am particularly attracted to that alluring engine and its aesthetics.

The ABC, or Active Body Control Suspension system, is an advanced hydraulic suspension mechanism that utilises sensors, hydraulic pumps, and filters. Malfunctions can trigger numerous warning lights on the dashboard, lead to suspension failure, or default to sports mode, resulting in a harsh ride. These issues typically stem from leaks, insufficient fluid levels, and obstructed filters, all indicative of inadequate maintenance. My S Class is equipped with Airmatic suspension, which operates with compressed air, and the struts alone cost over one thousand dollars each.I am taking a risk by substituting a pair with less expensive replacements, but each time I have attempted this previously, the car has caused me problems.

Thank you for your assistance. I will undertake all feasible maintenance. What constitutes the ABC? The vehicle will possess minimal mileage, hence it is expected to achieve 50,000 kilometres with relative ease.

Indeed, it is an exquisite vehicle; but, one must account for the associated operating expenses. As previously noted, it is a costly automobile that incorporates advanced technology, which can be expensive to repair. I have observed CL500s with ABC suspension issues being sold for a nominal price.I would still appreciate one, however!

I believe the CLs appear impressive and can be acquired at a low cost. It is essential to acknowledge that you are purchasing a vehicle that originally retailed for approximately $100,000; hence, all associated parts and servicing will correspond to that initial cost, rendering them expensive. I would seek a vehicle with few previous owners, an extensive service history, and simply relish the experience. I am confident it will elicit considerable joy while engaging in activities outside.

Greetings to all, I am considering purchasing a 2008 CL500. What is the overall assessment of this model? Do you find it favourable, or is it fraught with issues? Any assistance would be greatly appreciated.

If you are prepared to forfeit one of the dash vents, you might install a gauge in that location.

Is your radio a double DIN or single DIN? If it is single DIN and there is a cubby hole beneath it, you may be able to acquire a blank panel to install gauges. Alternatively, if there is an unused ashtray, that could serve as a potential area for them.

I seek something more nuanced than that. If there were an A-post mount that adequately fits a RHD W204, I would consider it.

Perhaps not...