No problem with dealership or warranty issues, in fact it's quite the opposite, they've been very helpful in catching the many things wrong with my vehicle. I suggest not buying a Chevy as their quality is sorely lacking these days, several recalls, my upgrades interior is scratched everywhere even with gentle usage as the material is cheap and on top of it all the vehicle gets terrible gas mileage. In short the service at OMS is very adequate it's GM quality that's the issue