Mobil 1 10w-30 or Mobil 1 0w-40

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My first pick is Truck & SUV 5w-40 but its not easily available. If I was going to stay with Mobil 1, should I switch to their 10w-30 or their 0w-40. I use it in gas engines that like xw-30 or xw-40. Regards, Brian
 

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The 0w40 seems to be very a very good oil, given it's extensive OEM use by Porsche..... FWIW, my Town Car seems to like it.
 
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Hi, brian - There are significant formulation similarities between M1 TDT 5W-40 and M1 0W-40 If TDT is not available then M1 0W-40 is a great choice. Many in EM would say that M1 0W-40 is a better product than TDT for use in petrol engines
 
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