I have never heard of anything like this before or heard of anyone using 87 Octane because of the low temps.

The service manager is recommmending something contrary to what the book says to do. Sounds fishy to me.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record