Here's how to do it. Changed my oil this past weekend so figured I'd de-mystify this process. The common concerns are 1) is it ok to mail/ship used oil? and 2) how does FCP make money offering this? Yes, as far as I can tell from my research, it's ok to mail the used oil just like it's ok to mail your kit to BS. The flash point of ~400 kicks it out of being classified as a hazardous material per the USPS's documents and you tell them what it is when you mail it (liquid - motor oil). Some folks have reported the USPS denying it and it's just that they aren't familiar with this so be prepared - BS has a letter you can print out detailing why it's ok to do/meets the requirements. FCP makes money b/c it's a likely a low take-rate on this b/c of the hassle factor just like a rebate - many don't take advantage of them. Additionally, you buy other crap when you on their site and most of it will never be returned. I use it for oil, cabin filters, spark pugs, and wipers and combine shipping to maximize my refund. So I get my LM oil change kits for $21 is the bottom line putting it cheaper than about anything else.
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