BMW 135i 2008 Coolant Type Guide: Correct Spec for Optimal Performance

Maintaining your 2008 BMW 135i’s engine health starts with the right coolant—specifically, Dex-Cool 50/50 mix, the industry-standard blend that protects against corrosion and overheating.

The original and recommended coolant for the 2008 BMW 135i is Dex-Cool 50/50, a mix of 50% ethylene glycol and 50% water. This precise ratio ensures optimal heat transfer and protection, preventing rust and scaling inside the cooling system. Using non-Dex-Cool or improper mixtures can lead to costly engine damage over time.

Choosing the correct coolant isn’t just about compliance—it’s critical for longevity. The 2008 BMW 135i’s cooling system is engineered to work specifically with Dex-Cool 50/50. Using incorrect coolant compromises heat dissipation and accelerates corrosion, risking leaks and engine failure. Always verify compatibility before refilling.

When refilling, drain old coolant completely and flush the system with distilled water before refilling with new Dex-Cool 50/50. Check for leaks monthly and replace coolant every 30,000 miles or as service recommends. Regular maintenance ensures your coolant continues protecting the engine efficiently.

For your 2008 BMW 135i, trust Dex-Cool 50/50 as the definitive coolant choice. It’s engineered for performance, reliability, and engine preservation. Keep your coolant right—your engine will thank you.

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View the coolant type, capacity and the recommended change period. Shop for the best Antifreeze / Coolant - Vehicle Specific for your 2008 BMW 135i, and you can place your order online and pick up for free at your local O'Reilly Auto Parts. BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) BMW 1 Series Coupe/Convertible Forums Coupe and Convertible General Discussion 135i coolant capacity?

Recommended antifreeze for radiators of BMW 1. BMW Coolant Type and Capacity BMW Coolant Type and Capacity This post includes data aggregated from multiple sources on BMW coolant type and capacity. If any of this data on BMW coolant type and coolant capacity conflicts with data from your owner's manual, follow your owner's manual.

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Detailed repair manual for the 2008 BMW 135i Convertible (E88) L6-3.0L Turbo (N54). Product Specifications Other Name: COOLANT Fits the following BMW Models 2008-2013 BMW 135i Convertible N54 Engine (E88), Convertible N55 Engine (E88), Convertible (E88), Coupe N54 Engine (E82), Coupe N55 Engine (E82), Coupe (E82) Contains no nitrates or phosphates, reducing harmful deposit formation.1 gal. bottle.

BMW seem to think there is no need to change the coolant on our cars, despite the manufacturer Glysantin recommending it is done every 3 to 4 years because of its properties breaking down and becoming acidic. Water pump failures are common on E series cars including on the N55 engine so I.