Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not for use with Synthetic Oil

used this on my 2002 BMW and it seemed to work great, but the next time I went to use it- oil started coming out of the T-Handle where air normally is the only thing that escapes. I called the manufacturer, and they advised me that some synthetic oils (Mobil 1 in my case) can cause the seals in the lower part of the canister to degrade and will allow oil to bypass. They informed me that it would be covered under warranty- but Tool Topia is not working with me. When you call the line for returns, they have you leave a message- nobody ever calls you back either. I have called 4 times in the last 6 days- and nothing.Don't buy this if you use synthetic oil, it won't last long enough for your second oil change.