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Discussion Starter #1
I have been putting amsoil 15/40 synthetic in my truck. However I have moved into a new apt and I wont be able to plug my truck in as much during the winter. I was wondering if anyone cud tell me if its ok to switch to 5/40 for the winter. And back to 15/40 when its summer or Shud I stay with what I have.
 

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Either way, I have done both and have had no starting problems in the winter. We typically see 10 below, sometimes colder here.
 

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X2 Either way.
 

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Depends how cold it gets where you are... -30C ... lighter oil is a lot better :)
 
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