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Originally Posted by SmokeyWren
It won't help with wintertime starting because 15w40 is 15w40, regardless of whether it's made from castor beans or long-dead dinosaurs.
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Not true. You might want to brush up on the API's read-accross and interchangeability guidelines. The difference in pour points and viscosities at temperature can vary considerably between a conventional 15W-40 and a synthetic blend 15W-40 oil.
The dino Rotella T 15W-40 is a good oil. However, there are other 15W-40 oils, including synthetic blends, that will have better properties for winter use. Even the non-synthetic blend Motorcraft 15W-40 has slightly better cold weather properties than the dino Rotella T 15W-40.
I'm not a big synthetic oil fan, but they have their purpose, especially in cold weather, particularly where more harsh idling and operating conditions exist. Synthetics and synthetic blends generally maintain their viscosities better/longer than dino oils in these situations.
