What the heck type of coolant to use? (Kia Optima)

Messages
258
Location
Western NY
So it's time for a coolant change on my 2005 Kia Optima and I'm thoroughly confused. There's too many options on the shelf so I decided to check my manual. I figured there'd be a spec listed and I could just look on the back of the bottle for one that met that spec. Well, no luck. All it says is to use a quality glycol coolant. So I start reading up on the various options..... IAT, OAT, H-OAT, POAT. And now I'm more confused than I've ever been about anything. confused I was looking at MaxLife, but then I'm reading it has phosphates and silicates. Then I'm reading that Asian cars don't like silicates. People seem to like G-05 but I don't know what the heck it is. Zerex Asian? AutoZone cheap stuff? Prestone Extended life???????? confused I think I'm overthinking it.
 
Messages
14,635
Location
The Old North State
Got a Pepboys nearby? If so, go grab a gallon (or however much needed for 50% concentration of AF) of OEM brand Concentrated Green. It's an Asian P-HOAT and comes in full strength ~$20 gallon, good price for full strength and it's a long life coolant. Use distilled water to combine with. Zerex Asian is an option too but it only comes as premix. I like Peak Global Lifetime too, if you can find it in full strength at Napa. Forget MaxLife, been discussed here before, do a search, nothing special. http://www.pepboys.com/product/details/879918/00094/car_care/antifreeze_coolant/antifreeze_coolant
 
Messages
524
Location
sc/fl
Kia calls for an Ethylene Glycol based coolant. Anything with an Ethylene base should do just fine. No reason to stress over coolant.
 
Messages
14,635
Location
The Old North State
Quote:
Kia calls for an Ethylene Glycol based coolant.....
As do Honda, Nissan and others, but owners manual AF recommendations can be notoriously vague. Guarantee you Honda and Hyundai/Kia doesn't recommend or use an oem silicated original green. I wouldn't use an original green as my first choice here.
 
Messages
2,024
Location
USA
Originally Posted By: tinmanSC
Originally Posted By: Eddie
Zerex Asian would be my choice.
Mine too.
Mine three.
 
Messages
2,596
Location
CenTX
My Favorite was always zerex THOUGH, G05 was recommended for my 2.3L Ford Ranger 2005 Asian Zerex was recommended for the 2.3L Mazda Truck 2005 I found it funny that pretty much the same engine had 2 different recommendations it got Zerex Asian last, was cheaper at NAPA than the g-05
 
Messages
669
Location
North Bend
Originally Posted By: Smcatub
So it's time for a coolant change on my 2005 Kia Optima and I'm thoroughly confused. There's too many options on the shelf so I decided to check my manual. I figured there'd be a spec listed and I could just look on the back of the bottle for one that met that spec.
In confusion, there is profit to be made. It's not worth over-thinking. Use Peak Global (it's in a gold-colored jug). You can order the concentrated stuff through NAPA, if not in stock - about $15/gal. Some Menards stores also carry it, or call around. The diluted 50/50 version is available at most K-Marts - about $10-12. It works in any vehicle. FWIW, this antifreeze is likely to outlast the plastic-capped radiators that are so popular in Asian vehicles these days. And, at least on a Subaru, you'll be changing the timing belt and water pump before the antifreeze.
 
Messages
3,870
Location
WI.
the best way is to buy full strength and 5 gallons of distilled. drain the old coolant out the radiator, refill with distilled, repeat intil clear, drain the radiator and add the new coolant to 50% of capacity. I went with Toyota Red in my Honda. G/L
 
Messages
10,890
Location
Cincinnati, OH, USA
Originally Posted By: GumbyJarvis
My Favorite was always zerex THOUGH, G05 was recommended for my 2.3L Ford Ranger 2005 Asian Zerex was recommended for the 2.3L Mazda Truck 2005 I found it funny that pretty much the same engine had 2 different recommendations it got Zerex Asian last, was cheaper at NAPA than the g-05
Try the Ford dealer for some Premium Gold next time, same as G-05 for less $!
 
Messages
1,848
Location
Laramie, WY
Originally Posted By: dblshock
the best way is to buy full strength and 5 gallons of distilled. drain the old coolant out the radiator, refill with distilled, repeat intil clear, drain the radiator and add the new coolant to 50% of capacity. I went with Toyota Red in my Honda. G/L
Totally agree, then repeat every 100k? I think my toyotas recommended a change at 100k
 
Messages
1,848
Location
Laramie, WY
Originally Posted By: 01_celica_gt
Originally Posted By: dblshock
the best way is to buy full strength and 5 gallons of distilled. drain the old coolant out the radiator, refill with distilled, repeat intil clear, drain the radiator and add the new coolant to 50% of capacity. I went with Toyota Red in my Honda. G/L
Totally agree, then repeat every 100k? I think my Toyotas recommended a change at 100k
You forgot to add to run the car until the lower radiator hose is HOT, this will allow the thermostat open up to circulate the coolant
 

Smcatub

Thread starter
Messages
258
Location
Western NY
Thanks for all the answers guys! That's my usual MO with coolant changes, the distilled H2O drain and fill method. My cooling system holds a little less that 8 quarts, so I'm lucky in that a full gallon gives me a bit above 50/50 without any extra coolant to decide what to do with. It's too bad the Zerex Asian only comes in 50/50. I'm not sure I could completly empty my cooling system and I don't want to end up with a 40/60 mix or anything like that, so that one's off the list. There's a Pep Boys near me - I'll check them for the OEM green, and pick up a bottle of Peak Global lifetime otherwise. Thanks for all your input guys!
 
Messages
9,521
Location
Canuck - moved to Texas
Originally Posted By: GumbyJarvis
My Favorite was always zerex THOUGH, G05 was recommended for my 2.3L Ford Ranger 2005 Asian Zerex was recommended for the 2.3L Mazda Truck 2005 I found it funny that pretty much the same engine had 2 different recommendations it got Zerex Asian last, was cheaper at NAPA than the g-05
That's because your "asian" Mazda will have a severe alergic reaction to silicates wink
 
Messages
14,635
Location
The Old North State
Originally Posted By: Smcatub
...It's too bad the Zerex Asian only comes in 50/50. I'm not sure I could completly empty my cooling system and I don't want to end up with a 40/60 mix or anything like that, so that one's off the list...
And besides being a sweet money maker for the manufacturers/sellers that's the problem with a premix. If you want to do a complete flush/distilled flush series, it's difficult without being wasteful of AF to get the coolant concentration you seek. Unfortunately that is how the majority of oem Asian P-HOAT LL AF's now come.
 
Messages
3,100
Location
GA.
A giant +1 !!! It's exactly what I use (available from NAPA) in my Hyundai and Kia vehicles !!
Originally Posted By: Eddie
Zerex Asian whould be my choice.
 
Top