Remove the old oil filter using a small filter wrench, if necessary, and replace with the new filter. You should always lubricate the gasket on the new filter with a small amount of engine oil, as well as put some fresh oil in the filter. Due to the JK’s horizontal oil filter, take care to not over fill it; otherwise, you may be taking a bath sooner than you planned. Never use a wrench or any other tool to tighten the new filter. Hand tighten only!