Our new website is live
Our full product range, a step-by-step product finder and practical lubrication guides are now online in Persian and English.
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Lubricants · Base oil · Bitumen · Fuels
Industrial oil distribution across Iran
Supply and distribution of industrial lubricants, base oils and petroleum products for industry and transport fleets.
From our range
All products Featured products
fully synthetic
Diaco Ultra 5W-30
Passenger car engine oils · 5W-30
Low-SAPS chemistry that protects particulate filters and catalytic converters.
View productsynthetic-blend
Diaco Turbo Max 15W-40
Heavy-duty diesel engine oils · 15W-40
Our flagship truck oil for Euro V/VI engines with DPF and EGR systems.
View productanti-wear
Diaco Hydra HM 46
Hydraulic oils · ISO VG 46
The most widely used hydraulic grade in Iranian industry and plant equipment.
View productpenetration-grade
Bitumen 60/70
Bitumen · 60/70
The most widely used paving grade for hot climates and heavy traffic.
View productProduct families
View all Every lubricant you need, from one supplier
Choose a group to see its products, grades and packaging.
Product finder
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Tell us what you run and we'll show the products made for it.
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Pick the sector closest to your equipment.
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Why Diaco
Supply, distribution and commercial services in one place
For workshops, fleets, plants and contractors: genuine products, complete documentation and on-time delivery, in a single order.
Documented productsTechnical data and an official invoice with every order.
Nationwide deliveryDelivery to every province of Iran.
Genuine productsSourced only from reliable producers and suppliers.
Commercial servicesImport, export, customs clearance and warehousing.
Lubricant distributionImport & exportCustoms clearanceWarehousingTechnical adviceSupply contracts
Supply · Distribution · Advice69+products in our range
15product categories
2024year founded
20billion rial registered capital
Industries
View all Lubricants for every industry
Workshops & auto shops
Engine oils and fluids for workshops, dealers and auto-parts shops.
Transport & fleets
Diesel engine oils, gear oils and coolants for trucks and buses.
Construction & roads
Bitumen and lubricants for heavy equipment, for builders and road contractors.
Mining & quarrying
Lubricants for haul trucks, loaders, crushers and conveyors.
Agriculture
Engine oils, transmission oils and greases for tractors and harvesters.
Power generation
Turbine, transformer and engine oils for power plants and generators.
Marine & ports
Marine engine oils, cylinder oils and greases for ships and port equipment.
Steel & metalworking
High-temperature greases, gear oils and cutting fluids for metal industries.
Guides
View all A guide to choosing and caring for lubricants
Passenger car engine oils
What does 5W-30 actually mean?
The number before the “W” (for winter) shows how easily the oil flows when the engine is cold. The lower it is, the faster the oil…
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Passenger car engine oils
Synthetic, semi-synthetic or mineral?
Mineral oils are refined directly from crude oil. Synthetic oils are made from highly refined or chemically built base oils with m…
Read morePassenger car engine oils
How often should you change engine oil?
As a rule of thumb, most cars on synthetic oil can run around 10,000 km or one year between changes, and around 5,000 km on minera…
Read moreBlog
All articles Answers to common oil questions
Passenger car engine oils
Why is my engine using oil? Causes and fixes
Where does engine oil go? Burning oil, leaks, worn rings and valve seals, the wrong grade — how to tell which one it is and what to do.
Passenger car engine oils
API oil standards explained: what SN, SP and CK-4 mean
What do the API letters on an oil bottle mean? SL, SN, SN Plus and SP for petrol engines, CI-4 and CK-4 for diesels — and how to choose.
Passenger car engine oils
Can you mix two different engine oils?
Is it safe to mix engine oils of different brands or grades? When it is fine, when it is not, and what to do afterwards.
News
View all Latest from Diaco
Petro Pakhash Diaco becomes a private joint-stock company
Following its extraordinary general meeting, the company converted from a limited liability company to a private joint-stock company and adopted a new three-member board of directors.
Read moreRegistered capital increased to 20 billion rial
The increase supports a larger product range and the growth of our distribution activity across the country.
Read moreSales team
Talk to our sales team
For prices, stock, data sheets and orders, call or email our sales and marketing team.
Request a quote
Sales line+98 21 3650 4296
Sales emailsales@diaco.co
Head officeUnit 4, 2nd Floor, No. 15, Shahid Hassan Delavar 2 Alley, Seraj-ol-Molk Alley, Baharestan Square, Tehran
Saturday–Wednesday, 8:00–17:00
Saturday–Wednesday, 8:00–17:00