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When did Shell start making the synthetic T6 in 15-40? I just saw it on Walmart’s website. I usually switch to Mobile 1 5-40 in the winter and run Dino 15-40 in summers. This 15-40 synthetic from Shell looks interesting
 

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I have seen it here in Florida for about a year. Not all Walmart stores have it but in my area most do.
 
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