Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worked for 1 1/2yr, then stopped sucking

Used only for oil changes on Mobil1 full synthetic 0w-40.Worked great at first, would suck 7qts of oil out in about 10 minutes without it being warmed up. Then slowly over a year it would take longer and longer, up to 20-30 minutes of endless pumping. It seemed as if a seal somewhere was going. If I kept pumping the flow would continue but as soon as I stopped there was no vaccuum left to keep pulling.I took it apart and cleaned all the seals I could get to which helped a little bit it never worked as quickly as it had initially. It went out with the trash this morning.