Dryalite Headlight Moisture-Fix Kit | BMW 4 Series F32/F33/F36 (2013-20) (pair)
Dryalite absorbs humidity from the air inside your headlight. Choose your vehicle to find the right kit.
Kit: £50.00 - Available.
Fitment and specification
- Your headlight has non-removable / sealed caps (no twist-off access caps)
- Your cap has a different part number
- 2 × Dryalite Moisture-Fix Caps (left + right)
- 2 × 50g silica gel desiccant packs
- Open the bonnet and locate the top access dust cap on the headlight.
- Twist the original cap off by hand.
- Fit the Dryalite cap in its place.
- The desiccant will absorb moisture over time.
- This kit is intended for condensation / humidity issues. If there is standing water, a cracked lens, or damaged seals, the underlying leak should be repaired first.
- Not all BMW 4 Series headlights use the same cap – fitment is based on the dust cap part number and a visual match, not model year alone.
How does Dryalite reduce condensation?
Dryalite holds moisture-absorbing silica gel inside vehicle-specific headlight caps. It absorbs water vapour from the air inside the headlight, leaving less moisture available to condense on the lens.
For twist-off cap kits: follow the steps below. No cutting or drilling is needed. The sealed-cap F10 kit has a different fitting method; follow its product-specific instructions instead.
Installation instructions for twist-off caps
- Remove the original cap: twist it off the headlight.
- Transfer the gasket: carefully lift the original gasket seal off the OEM cap and fit it onto the Dryalite part. A small screwdriver used gently as a pick usually helps; take care not to damage the seal.
- Load the silica: remove the silica gel packets from the sealed outer bag, keeping the packets intact. Unscrew the threaded lid from the Dryalite part, place the packets inside, then screw the lid back on.
- Fit the Dryalite part: check that the original gasket is fitted and the silica packets are inside. Twist the part onto the headlight in the same way as the original cap.
Both the original gasket and the silica gel packets are essential. Without the gasket, the Dryalite part will be loose and will not work effectively. You can transfer the gasket or load the silica first, but complete both before fitting the part to the headlight.
Recurring misting, not active leaks. If the headlight is cracked or has pools of water inside, Dryalite will not fix it. Repair the fault first.
Green means recharge.
Remove the silica packets, dry them until the beads turn orange, let them cool, then put them back.
30-day full-refund guarantee
If it does not help, return your kit within 30 days for a full refund.
Questions before ordering.
Will Dryalite fix every condensation problem?
No. Dryalite absorbs humidity from the air inside the headlight. It cannot repair a cracked headlight or deal with pools of water inside it.
Is the silica gel loose inside the headlight?
No. The silica packets sit securely inside the Dryalite cap, away from the bulb and reflector.
How quickly should I see a difference?
Some buyers see an improvement within hours. Allow a few days, as every headlight starts with a different amount of moisture.
Can I dry my headlights with a hairdryer before fitting Dryalite?
Warming a headlight can clear visible mist temporarily, but it does not necessarily remove the moisture: droplets may simply turn back into water vapour. If you choose to use a hairdryer, follow your vehicle manufacturer’s guidance and avoid high heat, which can damage plastic, seals or electronics. Let the headlight and the air inside cool to ambient temperature in a clean, dry, sheltered place before refitting the caps. Warm air can contain more water vapour before condensation forms; if warm, moist air is trapped inside, misting can return as the lens cools. Cooling alone does not remove moisture. Dryalite absorbs water vapour to help lower humidity after fitting.
Why use Dryalite instead of leaving the dust caps off?
Removing a dust cap may help moisture escape temporarily, but leaving it off also exposes the headlight to dust, debris and water splashes. It does not actively absorb moisture, and damp outside air can enter again. A correctly fitted Dryalite cap with an intact seal keeps the access opening covered while silica gel absorbs water vapour inside. This helps manage humidity while keeping debris out, rather than leaving the headlight open. Keep the headlight’s original ventilation paths clear, and repair damaged housings or seals first.
How do I choose the right kit?
Choose your model above and compare the product photos with your headlight cap. Contact us if you want help checking.
Can the silica gel be reused?
Yes. Orange means ready and green means saturated. When the beads turn green, remove and dry the silica packets, let them cool fully, then refit them. Never heat the caps or seals.
Do I need to permanently modify my headlights?
Twist-off cap kits require no permanent modification. The sealed-cap F10 kit uses a different fitting method, so check its product details before ordering.
How often will the silica need recharging?
It depends on the weather and your headlight. Check the indicator beads and recharge only when they turn green.