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I was wondering if it is safe to use STP gas treatment in gas tank for a s500. The owners manual says using a premium unleaded gas is enough and not to add addictives. If it is safe, is it necessary to use gas treatment or is it just overkill? Thanks.
 

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I wouldn't recommend it. If you use premium gas and vary the brand every couple of months, the additives in the fuel should keep you running clean. I don't think it would hurt anything, but I can't see a benefit from using such a product.
 
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