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"Techinspector1" is correct. I have had a Firebird with a healthy cam and one time in Alberta we had a sudden temperature drop from +40's to -25 in just 12 hours...it was running higher compression but when it warmed up it was fine...the vehicle should start fine within an hour, it's when you leave it outside long enough for the oil to get thick is when you have something to worry about. If you plan on running the truck all winter, most definitely run synthetic..I usually never drove it in cold weather like that but I didn't have a choice this time.
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