HOAT Coolant vs OAT vs IAT: What European Cars Require
Your 2015 Audi A4 takes G13 coolant. Run the orange HOAT from the parts store and the water pump seals fail in eighteen months.
By Lee Shahin ·
European vehicle fluid and spec guides
The right fluid, the right spec, the first time.
The specification answers dealers do not explain: which coolant, oil, brake and transmission fluid approval your engine actually needs, and what goes wrong when it gets the wrong one. Written by Lee Shahin after 18 years in the Mercedes-Benz and BMW parts trade.
Start with your car
Start with the pillars
The cluster spine: what each specification means, which engines it covers, and what supersedes it.
BMW Antifreeze: Current Grey Spec and the Blue It Replaced
Explore BMW antifreeze specifications, focusing on the current grey spec (BMW GS 94000) and the blue it replaced. Learn about compatibility and performance.
By Lee Shahin ·
Mercedes Benz Coolant: MB 325.0 and 326.x Explained
Mercedes benz coolant systems are engineered around specific coolant chemistries that protect dissimilar metals—aluminum heads, magnesium blocks, copper heat exchangers—from galvanic corrosion and cavitation erosion.
By Lee Shahin ·
BMW LL-01 Oil: Specification Meaning and Approved Oils
A 2008 335i takes LL-01 oil. Run a generic 5W-30 without that sheet approval and the Valvetronic solenoids clog first, then the VANOS actuators start hunting.
By Lee Shahin ·
Volkswagen Coolant: G12, G12evo, G13, and G40 Explained
When it comes to Audi and VW coolant specifications, understanding the differences between G12, G12evo, G13, and G40 is crucial for maintaining vehicle performance.
By Lee Shahin ·
Porsche Cayenne Coolant Specs, Colors, and Approved Products
Porsche Cayenne coolant specifications, approved colors, and manufacturer-listed products by model year and engine to maintain optimal cooling system performance.
By Lee Shahin ·
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Every guide for your car in one place.
Why read European Wholesale Parts
18 years in the European parts trade
Every guide is written and reviewed by Lee Shahin, who spent 18 years at the Mercedes-Benz and BMW parts counter before founding EWP.
Manufacturer-approved specifications, not guesses
Every article names the approval, BMW LL-01, Mercedes 229.5, VW G12evo, Porsche A40, and says what happens mechanically when the wrong one goes in.
Current specs, not stale ones
BMW coolant went from blue to grey. G13 was superseded by G12evo. LL-01 split into LL-01 and LL-17 FE+. Most sites still carry the old answer.
Independent
We recommend what meets the spec. Where an article links to a product we earn a commission, we say so on that page, and it never changes a fitment statement.
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