I'm changing a corroded Mercruiser 5.7 oil pan and likely the timing cover gasket while the engine is already raised with easy access to the cover. Has anyone had luck with using the original cover with a new gasket or is it highly recommended to replace the cover as well. Older 1988 boat with low hours and original timing cover and oil pan. My plan was to not touch the cover if there is no seepage of oil but perhaps a new gasket would make sense while the motor is pulled up. Thanks.