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Dear Spook,
I use 87C in my NA 940. Replaced every 5 to 6 years.
As you're replacing the tstat, there's a new Volvo coolant. Its Glysantin G64. Part #31439720 for 1 litre bottle. Supersedes #9437650. I use 2.5 litres diluted with distilled water as I've deleted the heater. More heat exchanging ability. Suits all Volvo cars. Been using this for the past 4 months. Less blue-green, more to light green, compared to type C. Suits my tropical climate so far : ))
http://www.performancechemicals.basf.com/ev/internet/keroline/en/content/fuel-lubricant/news/2015-06-18-P259-Keeping_downsized_engines_cool
http://www.ihssupplierinsight.com/news/31367/basf-supplies-new-engine-coolant-to-volvo
Regards,
Amarin.
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