Carbon Fiber Coolant Cap BMW G80 G82

BMW M3 G80 / M4 G82 carbon coolant cap — an engine bay that finally lives up to expectations

Dress up your BMW M3 or M4 coolant reservoir with this BMW M3 G80 carbon cap made from genuine carbon fiber, a racing signature of the M Performance Parts packs. This part replaces the original plastic element and brings complete visual consistency to the engine compartment, from the intake cover to the engine cover. Whether you drive a G80 sedan, G81 Touring, G82 coupe, or G83 convertible, you immediately transform the look of your engine bay the moment you open the hood. A detail? Perhaps. But it's precisely the one people notice when they open the hood in front of someone who knows the car.

A design that extends the M Performance pack

The original expansion tank is the only translucent white element in the middle of an entirely black and carbon engine bay. By installing this carbon coolant reservoir cover, you eliminate this visual break and unify the whole: engine cover, intake cover, strut tower brace, and reservoir finally share the same weave. On an M3 G80 equipped with the factory carbon pack, the consistency is complete; on a version without carbon options, it's the first part to install to start the theme.

Easy installation and everyday protection

Pre-formed according to the original dimensions, this cap mounts as a direct replacement for the original cap in less than 10 minutes, without any special tools. You unscrew the old cap, screw in the new one, and the seal of the reservoir remains fully ensured by the original gasket. The cap also protects the reservoir against heat buildup and hydrocarbon splashes on a daily basis. Immediate maintenance with a microfiber cloth.

Carbon fiber quality and available finishes

This part is molded in genuine pre-impregnated carbon fiber under pressure for maximum rigidity and low weight. The high-gloss anti-UV polyurethane varnish preserves the shine of the weave against UV rays, engine thermal variations (up to +110°C), and hydrocarbons. You choose from three finishes: glossy 3K twill carbon for a deep effect, matte carbon for a sober look, or forged carbon for premium exclusivity with a unique marbled pattern on each piece.

• Three carbon finishes to choose from — glossy 3K twill, matte, or forged with a random pattern.
• Direct screw-in replacement — less than 10 minutes, no special tools, no bleeding.
• Thermal resistance up to +110°C — designed for the environment of an S58 TwinPower Turbo engine bay.
• BMW engine bay carbon accessory — consistent with the intake cover and engine cover.
• Original sealing preserved — the reservoir gasket remains the manufacturer's.

Vehicle compatibility

Part dedicated to BMW M3 G80 sedan, M3 G81 Touring, M4 G82 coupe, and M4 G83 convertible, S58 TwinPower Turbo engine. Check the chassis on your registration card before ordering to guarantee a perfect fit of the cap on the original reservoir. The thread pitch and diameter strictly follow those of the factory cap.

Does this carbon cap really withstand engine heat?

The concern is legitimate: poorly varnished carbon placed a few centimeters from a manifold turns white or clouds over in one season. Here, two elements answer the question. First, the material: a pre-preg cured under pressure retains its geometry where painted ABS warps. Next, the anti-UV polyurethane varnish, formulated for the engine environment, which withstands repeated hot-cold cycles and oil splashes without opacifying. In practice, a wipe with a microfiber cloth after each maintenance session is enough to preserve the depth of the genuine carbon over time.

Why order your BMW M3 G80 carbon cap from Becquet Voiture?

Becquet Voiture is a French specialist in BMW M Performance accessories and only selects carbon parts tested in real conditions. You benefit from tracked delivery in France and responsive French-speaking support, capable of confirming the compatibility of the part with your chassis before purchase. Discover also our BMW performance accessories and our car steering wheel covers.

Order your carbon coolant cap today and give the engine bay of your M3 G80 or M4 G82 the finish it deserves.

Type: Coolant reservoir cap
Material: Genuine pre-impregnated 3K twill carbon fiber
Finish: Glossy, matte, or forged carbon to choose from
Varnish: High-resistance anti-UV polyurethane
Compatibility: BMW M3 G80 / G81, M4 G82 / G83 (S58 engine)
Thermal resistance: Up to +110°C
Position: Engine compartment
Installation: Direct screw-in replacement, approximately 10 minutes
Condition: New, pre-formed to original dimensions