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Well, I'm late to respond. But 87 deg. was too cool for my turbo car in western Oregon, I had sludge on dipstick during winter. Installed 92 and white goo gone.
My favorite Volvo specialist mechanic for 13 years always uses 92 on all 240, 740, 940s. non-turbo (NA) *and* Turbos.
Avoid Wahler brand, see Fritzgerald's posts about their poor reliability. This was my experience too. Vernet-Calorstat good.
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Try the Expanded Style FAQ Index - http://40mph.com/Brickboard_700-900_FAQ_Expanded_Index_Version/
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