Id get an attorney, tehy cant claim improper maintenance because of the BRand of oil, now if they used a diff than spec weight thats different. You have to really push some buttons an dpiss a few people off, but they will fix it under warranty. Id def get a law shark involved. (Even if he only sends them a letter mentioning lawsuit, they will jump on fixing it because its cheaper than even showing up in court) Thats the cool thing about third party mediations.