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If there was red antifreeze in there before, adding green product can cause sludging in the water jacket of the engine. They are not compatible. The right type for this engine is the red or orange type.
Have the system drained and flushed a few times, and refill with red type coolant mix.
The type or brand of coolant is not critical. However, the mixture is important. When replacing your coolant, be sure to use at least a 50/50 mix or antifreeze and water. But, do not exceed a 70/30 mix of antifreeze and water.
The dealer recommend GM Dex Cool Antifreeze. But there are complaint against this type of coolant. http://www.stevesnovasite.com/forums/archive/index.php/t-128547.html In GM cars we replace Dex Cool with Prestone green coolant. It's up to you. Ask before but if you decide to change the type of coolant then: If your intention is to add coolant only, then you need: Mix with ANY COLOR ANTIFREEZE ALL MAKES ALL MODELS of cars and light trucks add to ANY color antifreeze PRESTONE 50/50 PREDILUTED ANTIFREEZE/COOLANT EXTENDED LIFE up to 150000/mile 5 year protection. DO NOT ADD WATER.
If your intention is to flush the RADIATOR (Cooling System), then you need: Mix with ANY COLOR ANTIFREEZE ALL MAKES ALL MODELS of cars and light trucks add to ANY color antifrezze PRESTONE EXTENDED LIFE up to 150000/mile 5 year protection. On the back you have to read directions: Step 1 Drain. Step 2 Flush. Step 3 Fill. Recommended to ad 30% to 50% volume, distilled water. If you flush the system and rinse with water you must add only 30% water to the antifreeze. There is more water trapped inside the engine compartment, because the thermostat is closed. Make sure to have a coolant density tester. When you finish one of 5 balls must sink, that indicates that you reached 50/50 strength. That means 50% Prestone and 50% Water, which will provide to your car a -34F degree FREEZE-UP Protection , and +265F degree BOILOVER protection.The next day,with a cooled engine open radiator cap, and test the strength of coolant. If not quite right, then siphon coolant from the radiator and add antifreeze, or distilled water as necessary. Make sure to disposal the used coolant properly.
The label on the expansion calls for Glyco Shell coolant.
I have a stable of european vehicles each one asks for their own antifreeze type. I fill everyone of them with regular coolant. Buy extended life coolant labeled as compatible with all types, which is readily available.
The recommended mixture is 50/50 ethylene-glycol and low mineral
content water. Never use pure antifreeze. Only Mopar Antifreeze Coolant,
5 Year/100,000 Mile Formula (glycol base coolant with corrosion
inhibitors called HOAT) is recommended. This coolant offers the best
engine cooling without corrosion when mixed with 50% distilled water.
Antifreeze mixture must always be at least 44%, all climates year
round. Maximum protection (-90d) is provided with a 68% mixture
protection. If the percentage is lower than 44 percent, engine parts may
be eroded by cavitation, and cooling system components may be severely
damaged by corrosion.
CAUTION: Mopar Antifreeze/Coolant, 5 Year/100,000 Mile Formula (MS-9769)
may not be mixed with any other type of antifreeze. Mixing of
coolants other than specified (non-HOAT or other HOAT), may result in
engine damage that may not be covered under the new vehicle warranty,
and decreased corrosion protection.
CAUTION: Do not use coolant additives that are claimed to improve
the type of antifreeze u use is called "Long life or Extended life" coolant depending on who makes it, like Prestone and others, u can mix any brand of coolant as long as it is marked as one of the above, this coolant is generally yellow in color.