1991 BMW coolant mixing error

[Bluestream]

Based on info I took from this tread: https://bobistheoilguy.com/forums/threads/1991-bmw-735-coolant-recommendation.326108/

I did a coolant change on my BMW. However, I used 4L Motorcraft yellow (PHOAT?) that I had in stock and which I thought was G05 with 2L Zerex G05 HOAT which I bought. Mixed with 6L distilled water.

Are these compaible, or should I flush again?

 

[Rand]

I wouldnt feel safe with that combo.
I wouldnt use yellow and a combo of yellow and g05 is even less confidence inspiring.
but I'm not a bmw expert.

The whole yellow gold green orange speciality green etc can be confusing.

 

[Marcozi]

I use only BMW coolant and distilled water.

 

[FCD]

Based on info I took from this tread: https://bobistheoilguy.com/forums/threads/1991-bmw-735-coolant-recommendation.326108/

I did a coolant change on my BMW. However, I used 4L Motorcraft yellow (PHOAT?) that I had in stock and which I thought was G05 with 2L Zerex G05 HOAT which I bought. Mixed with 6L distilled water.

Are these compaible, or should I flush again?

Flush

 

[nthach]

BMW/Tesla G-48 uses 2-EHA. Prestone Cor-Guard and Ford yellow also uses 2-EHA. You’ll be ok. I doubt benzoate and 2-EHA/sebacate will feud.

 

[2strokeNorthstar]

Probably fine but just flush it and rest easy. BmW cooling systems already cause enough stress and loss of sleep without a questionable Coolant mix.

 

[930.engineering]

.
I'd perform another flush with BMW 'Blue' G48 = VW G11 + distilled water.
.

 

[chefwong]

Just short of a full flush, do any of you prescribe to mixing Blue + Zerez G05 in a pinch

 

[jeepman3071]

I use only BMW coolant and distilled water.

+1

It's fairly cheap to get the BMW coolant online and mix with distilled water.

 

[Bluestream]

Thanks all, Keep in mind this is a 1991 BMW that came from factory with Green Coolant, so I don't think I need the BMW blue.

I will do the flush for peace of mind, but may have to wait until spring. I just put a new rad in and the block drain plug sprays coolant in all directions. Not a fun job...

 

[JHZR2]

I ran G-05 in my 1991 BMW for almost 190k on original cooling system components. I don’t know what’s in the motor craft yellow, so that’s the wild card. I’d probably at least do one radiator drain and filll with g-05. It’s easy enough and cheap enough.