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1991 BMW 735 Coolant recommendation #5413797 04/26/20 02:32 PM
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Bluestream Offline OP
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Hello,

Looking for a coolant recommendation for 1991 BMW 735. Has cast iron block and aluminium head. Last time I used Peak long life, but am told these universal coolants have only 2% corrosion inhibitors, and dedicated formula has 5% inhibitors. Have Prestone dex-cool in the stash. Any thoughts?


2000 VW Beetle 1.8T M5
2006 Pathfinder 4X4
1991 BMW 735iL
"A fool and his money are soon parted" - Thomas Tusser
Re: 1991 BMW 735 Coolant recommendation [Re: Bluestream] #5413809 04/26/20 02:48 PM
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js1956 Offline
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Pentofrost NF


2015 VW Golf Mk7 2dr HB Man 1.8 TSI S

Re: 1991 BMW 735 Coolant recommendation [Re: Bluestream] #5413841 04/26/20 03:20 PM
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JohnG Offline
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Re: 1991 BMW 735 Coolant recommendation [Re: Bluestream] #5413849 04/26/20 03:29 PM
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2EHA Offline
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Zerex G48, avaliable 50\50 premixed at Walmart. If you need concentrate, head over to the local BMW or Mercedes dealer and ask for a gallon of blue coolant.

Alternatively, you can use PEAK OE Equipment European Blue 50\50 with a softer acid than most other blue blends but that's not a big deal in this car.

Re: 1991 BMW 735 Coolant recommendation [Re: Bluestream] #5413921 04/26/20 05:30 PM
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Gebo Offline
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Probably don't have the owner's manual? Get it from the BMW dealer.


'98 LEX LS400 310K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 75K

Shell Gas and Truck 5w-30
Amsoil OE 10w-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: 1991 BMW 735 Coolant recommendation [Re: Bluestream] #5413926 04/26/20 05:34 PM
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MCompact Online Content
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I use BMW coolant only- and I change it every two years. That regimen has served me well for 37 years and 12 BMWs.


Mine:
2014 M235i
2009 Cooper Clubman
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2015 X1 xDrive28i M Sport


Son's
2009 328i

Buy what makes you smile...
Re: 1991 BMW 735 Coolant recommendation [Re: Bluestream] #5414150 04/26/20 11:14 PM
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JHZR2 Offline
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G-48 or G-05. They are about the same with the exception of G-05 NOT having 2-EHA which IMO is a good thing in old systems. I personally ran G-05 in my 1991 318i for most of my 116k miles of ownership (bought used). The entire system minus the profile gasket was original, clean, and worked perfect.

Re: 1991 BMW 735 Coolant recommendation [Re: JHZR2] #5414161 04/26/20 11:45 PM
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2EHA Offline
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Originally Posted by JHZR2
G-48 or G-05. They are about the same with the exception of G-05 NOT having 2-EHA which IMO is a good thing in old systems. I personally ran G-05 in my 1991 318i for most of my 116k miles of ownership (bought used).

PEAK makes a G11/G48 blend with sodium benzoate instead of 2-EHA. Main upside to this route is that you get to keep the delicious dark blue color.

Last edited by 2EHA; 04/26/20 11:47 PM.
Re: 1991 BMW 735 Coolant recommendation [Re: Bluestream] #5414213 04/27/20 03:49 AM
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I woul probably run G-05


1975 Ford Capri II Ghia 3000 V6 - 315k, Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - 110k, Valvoline Maxlife 10W-40

Re: 1991 BMW 735 Coolant recommendation [Re: Bluestream] #5414958 04/27/20 07:32 PM
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Jake_J Offline
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Officially BMW would tell you to run BMW blue (aka G48) which does have 2-EHA. So if BMW is telling you to use their coolant with 2-EHA I wouldn't worry about picking a coolant that doesn't have it. Many BMW owners run Prestone without issues which until very recently was a straight Dexclone so you can make your own conclusion.

Re: 1991 BMW 735 Coolant recommendation [Re: Bluestream] #5418647 05/01/20 06:59 PM
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SR5 Offline
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BMW Blue (G48) is what I call G-05 Lite, they are very similar, but the G-05 has a few extra adds like Nitrite to protect Diesel engine liners from cavitation corrosion. Adds BMW blue for a gas engine doesn’t require, but it’s not a problem being there.

G-48 is gas only I believe
G-50 is gas and diesel rated

I consider them fairly interchangeable in a gas/petrol engine. I would happily run G-05 in your older BMW, but I would miss the great blue colour.


---------------------------------------------------------------------------------
Valvoline DuraBlend 10W40 SN & A3/B4 semi-synthetic + Valvoline V06 synblend media filter
Re: 1991 BMW 735 Coolant recommendation [Re: Bluestream] #5418921 05/02/20 07:03 AM
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FordCapriDriver Offline
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The modern BMW G48 contains 2-Eha, which the original coolant would not have had, so i'd probably run G-05 in it.
It has about half the silicate of G48 , 200-300ppm while G48 has 500-600ppm, but Nitrite which is good for cast iron and cavitation protection, Also Molybdate which is a rare inhibitor but one that works really well for many metals specially solder.


1975 Ford Capri II Ghia 3000 V6 - 315k, Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - 110k, Valvoline Maxlife 10W-40

Re: 1991 BMW 735 Coolant recommendation [Re: Gebo] #5419292 05/02/20 04:23 PM
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Originally Posted by Gebo
Probably don't have the owner's manual? Get it from the BMW dealer.


I bought the car new, so yes I have the owners manual, but that information is 29 years old.

Sounds like G-05 is what I want. Thanks to all who replied, I learned a lot...


2000 VW Beetle 1.8T M5
2006 Pathfinder 4X4
1991 BMW 735iL
"A fool and his money are soon parted" - Thomas Tusser
Re: 1991 BMW 735 Coolant recommendation [Re: Bluestream] #5419588 05/03/20 03:23 AM
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G-05 is a great choice, and readily available in the US.

However, if you want to retain that inky blue colour, there is Pentofrost NF, which is basically a VW G11 Spec coolant ( very similar to G48, but without 2-Eha )

Last edited by FordCapriDriver; 05/03/20 03:23 AM.

1975 Ford Capri II Ghia 3000 V6 - 315k, Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - 110k, Valvoline Maxlife 10W-40

Re: 1991 BMW 735 Coolant recommendation [Re: Bluestream] #5419882 05/03/20 10:52 AM
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I have a 1980 528i and an 1982 320. I have been using G-05 in them for years. I have also used the older BMW blue antifreeze in the past (not sure it was G48 back then). Before that I used plain old green IAT antifreeze. The G05 has worked fine for me for probably 20 years, I would recommend it.

wb

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