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I know this has been beat to death, and have searched the forums, everyone is running either 5-40 syn or straight dino 15-40, my question is is the t5 15w- 40 good also....live in maine and am changing to rotella, and grabbed this syn blend thinking it would flow better in the cold,.. advice..thoughts.....also am using the mobil 301 filter, just want the best for the rig!
Many thanks guys really appreciate the advice, and this forum rocks!

Greg
 

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just want the best for the rig!
Unless regularly seeing sub zero F temps no real reason to use 5w-??. 10w-?? good to zero per API. Only 5w-40 I've used has been the Rotella T6 and general stick to 15w/20w-50 oils by other mfgs. If best wanted w/o breaking bank Walmart sells M-1 15w-50. Syn-Blend is generally another marketing gimmick to squeeze out an extra buck per quart. If the Rotella blend happens to be in the weight desired it would be good to use. Just my opinion garnered from prior oil use.
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