McKinney Buick GMC

Horrible mechanics and service advisors. This dealer gave me an estimate of $2,420 to fix an oil leak in my 2011 Buick Enclave. I took it to a different mechanic for a second opinion and was told that the oil leak was coming out of a loose oil filter and not from the oil pan like they told me. The dealer was who changed the oil the last time as well. I fixed the issue with the for the cost of an oil change. Was the dealer being dishonest when they told me that to fix the oil leak they had to replace the oil pan seal/gasket which they had to bring the whole engine down and probably ruin my vehicle or did they not know what they were doing? I will never know, but I will never go back to that place and I don't recommend people taking their vehicle there for service either.