Had a first today - while under my SUV to change the oil I noticed a good deal of oil leakage all under the oil pan , skid plate , etc. When I removed the M1 oil filter the gasket was hard and flat on one side causing oil to leak through that side ... OCI was 9,000 miles over 6 months so nothing stupid long there . I used a oil filter cup socket plus socket wrench extension to remove the filter (Chevy TB oil filter is hard to reach) and the oil filter was snug - but not crazy tight like dealership or oil change places have installed in the past with cheap oil filters where the gasket was just fine with no leaks . Not sure what to make of this ? Not hating on M1 oil filters - but I find this strange .