thanks eveyone for your input - your comments just confirmed what I was planning on doing and have done at the end of every boat season here in Michigan - chance the oil/filter and drain the cooling system and re fill with antifreeze.
HI - so my question is simple, I only put on less than 30 hours on a 2004 5.0 Mercrusier this year - with this low hours is it really necessary to change the oil for the annual winterization project, It was changed last fall during the winterization. The powertrain only has 144 hours total on a...