Antifreeze OEM BMW or OEM Toyota

I’m running 110k miles in my M40 X3. There was a coolant issue but other than that it’s been an excellent engine.

I use BMW coolant cause it's similar in price, so why not. Actuall,y a little cheaper cause my dealer does discounts

By “air intake reservoir tank”, I assume you mean it’s the coolant tank for the water-air charge cooler. We need to know what car to tell if the coolant is suitable. That “G30” on the front is the important bit.

I used genuine bmw coolant as the price was around the same.

My last vehicle was an RX350 which I had for 14 years with 115,000 miles before trading it in and had zero leaks. I flushed/replaced the coolant at 100,000.

Proton original radiator is of very poor quality. Rust prone. Change it as soon and use premixed Toyota Coolant bought from Toyota Service Center to avoid fakes. Toyota SLLC and an aftermarket radiator will last the remaining lifetime of your Saga.

BMW coolant is down right awesome stuff.

Pink colored Toyota Coolant. My friend is a former mechanic and he recommended this over Honda's.

Mods: None, staying showroom stock. TCL Buyers Guide Negatives / future ownership issues: A) Valley Plate coolant leak: Look for pink crystals (dried coolant) underside of engine near where transmission meets up w engine. Also check upper radiator hose where it connects to radiator. Workaround: 50k/5 year coolant maintenance.

330i, coolant repairs.