I received a coupon from Service Street in the mail for a very good deal for an oil change so I went to Service Street in Aurora Southlands on 12/9/16 to get an oil change. While changing my oil the tech indicated that my 2007 Mazda CX7 has leaks. The tech said, he needed to degrease the site in question and add fluorescent dye to isolate concerns. I asked the service guy at the register where the leaks are and he said all over. I declined the service due to the engine was brand new and was still under warranty. The miles on the odometer of my 07 Cx7 shows 133K, but the new engine has less than 6K. When Service Street finished the oil change I called Parker Imports, the company that installed the new engine. We took the car straight to Parker Imports, the only leak Parker Import could find was an oil leak from the oil plug. The same plug that Service Street had just removed to change my oil. I took my CX7 back to Service Street and asked them to tighten the oil plug. Service Street insisted that there were leaks even though they wouldn't tell me where the leaks were so I called Parker Imports so they could tell the people at Service Street about any leaks they found. I asked Parker Imports tech to explain to Service Street people where my CX7 was leaking and Parker Imports indicated only at the oil plug. Not one person from Service Street debated with the tech from Parker Imports. I asked Service Street to fix my oil plug and I will never come to them again. You get what you pay for. Service Street Southlands is a dishonest business and I will never go to Service Street again.