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If you use Super Long Life Toyota coolant, you only need to replace it every 60K (according to my manual), so it's not expensive after all. I would stick to the OEM. If you don't probably nothing will happen for at least a long time, but even if you have to replace the water pump, say 50K from now, you pay a lot more than the price difference between coolants. Of course you never will know what really caused the problem, and you may be completely OK, but I sleep better if I use the OEM coolant.
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'05 Corolla S, 4 cyl 1ZZ-FE (90000 miles)
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