Beauty Best Davines Oil Guide: OI Line Explained and How to Use
An educational guide from the Beauty AMZ research team. No hard sell, just what you need to know.
The OI Line Story
OI is the Davines bestselling range, launched around their signature roucou oil. The line now spans shampoo, conditioner, oil, milk, and treatments. Its warm scent and elegant packaging made it a salon favorite worldwide.
Roucou Oil Benefits
Roucou oil is packed with carotenoids and antioxidants. It adds shine while protecting against environmental stress. It absorbs well without heavy residue. Davines sources it with sustainability in mind.
How to Layer OI Products
Start with OI Shampoo in the shower. Follow with Liquid Luster for extra gloss, then conditioner. On damp hair, apply All in One Milk. Finish dry ends with OI Oil. This layering gives the full luxury effect.
Getting Value from Luxury
The products are concentrated, so use small amounts. The large OI Oil lasts months with daily use. Travel sizes let you test before investing. Watch for gift sets around holidays for bonus value.
Sustainability Notes
Davines emphasizes carbon-neutral production and recyclable packaging. The brand offsets its footprint across the OI line. Refill options exist in some markets. Eco-minded buyers appreciate these efforts.
Recommended Products
These are the products our research team rates highest in this category.
Best for: You want luxury shine and a gorgeous scent.
Davines OI Oil, 4.56 Fl Oz
- Signature OI Oil with roucou oil
- Adds shine and softness
- Anti-frizz and heat protection
- 4.56 fl oz bottle
Pros
- Luxurious shine without heaviness
- Beautiful signature scent
- Salon-quality results at home
Cons
- Premium price
- Scent is strong for sensitive noses
- Overuse makes hair greasy
Best for: You want to test OI Oil before buying the big bottle.
Davines OI Oil, 1.69 Fl Oz
- Travel-size OI Oil
- Same roucou oil formula
- 1.69 fl oz TSA-friendly
- Shine and frizz control
Pros
- Cheaper way to try OI Oil
- Travel-friendly size
- A little goes a long way
Cons
- Poor value per ounce
- Runs out fast on long hair
- Still a luxury price
Best for: You have fine hair and want OI benefits lightly.
Davines OI All in One Milk, 4.56 Fl Oz
- Lightweight leave-in milk
- Detangles and softens
- Heat protection up to 446F
- Roucou oil formula
Pros
- Lighter than oil for fine hair
- Great detangler
- Strong heat protection
Cons
- Not as rich as the oil
- Milk texture takes getting used to
- Premium price
Best for: You want glass-like shine for special occasions.
Davines OI Liquid Luster, 10.14 Fl Oz
- Rinse-off glossing treatment
- Adds mirror-like shine
- 10.14 fl oz bottle
- Use after shampoo, before conditioner
Pros
- Dramatic shine boost
- Easy to add to any routine
- Large bottle
Cons
- Extra step in the shower
- Effects wash out over time
- Pricey for a rinse-off product
Best for: You want to experience the full OI routine.
Davines OI Shampoo 9.47 oz and All in One Milk 1.69 oz Set
- OI Shampoo 9.47 oz plus All in One Milk 1.69 oz
- Complete OI starter set
- Gentle, sulfate-conscious cleanse
- Roucou oil throughout
Pros
- Try the OI system together
- Shampoo is gentle and creamy
- Good gift for Davines fans
Cons
- Set costs more than singles
- Milk is only travel size
- Shampoo may not clarify well
Ready to Choose?
See our top product picks for davines oil, or jump straight to the head-to-head comparison of the two most popular options.
OI oil on fine hair: keeping the volume
Davines OI Oil is a smoothing oil, the natural enemy of volume on fine hair, so application has to be deliberate. Fine hair needs oil only where it frizzes: the mid-lengths and ends, never the roots. One pump warmed between the palms and pressed into damp ends gives shine and softness without collapsing crown lift. Two pumps or root application is the fastest way to turn a volumized style flat by noon. Apply to damp hair before blow-drying when you want smoothness with body, since heat distributes a thin film evenly; use on dry hair only as a finishing touch on the very ends. The OGX Biotin Collagen comparison covers a budget volume line that pairs well with a luxury finishing oil: the shampoo handles lift, the oil only polishes ends.
Layering oil with volumizing products
Oil and volumizing products coexist, but the order is fixed: volume products go on roots first, oil goes on ends last. Root-lift sprays and mousses need direct contact with the scalp to create grip, and oil migrating there kills their hold. Apply volumizer to towel-dried roots, blow-dry for lift, then press OI Oil through mid-lengths and ends. Watch total product load: a volumizing shampoo plus root spray plus mousse plus oil is four layers, and on fine hair that stack weighs more than any single heavy product. If volume collapses despite a volumizing shampoo, remove one layer before blaming the shampoo. For a direct comparison of Davines OI formats, the Davines OI oil guide breaks down when the oil, the milk, and the Liquid Luster each make sense.
When your volumizer becomes the problem
Volumizing shampoos work partly through polymers that coat each strand to make it feel thicker, and those polymers build up. After weeks of daily use, the buildup itself weighs hair down: the product bought for volume becomes the reason volume disappears. Signs include hair that feels coated even after washing and volume that dies faster than it used to. The fix is a clarifying wash every one to two weeks to reset the canvas. This matters doubly with a smoothing oil like OI, since silicones from the oil and polymers from the volumizer stack, so keep oil strictly on the ends. The Davines hair oil guide covers where each product sits in a weekly routine. Volume is maintained by what you remove on schedule, not just by what you add.