So, I know this may be an odd question and lots of people will probably ask "why", but I'm going to ask anyway. In my 1995 Subaru Impreza with the 2.2L and 185,000 miles, I've been using 10W-30 conventional oil at 5k OCI's. I'm working on getting the boat ready for the season and will be running to the marine store to get 25W-40 oil for the boat. They're advertising they have a well known brand of marine oil on sale in the 10W-30 grade. Other than the FW-C rating, is there anything wrong with using the Quicksilver 10W-30 in my Subaru or should I just stick with my conventional SN rated oil? The sale price is about $5 less for the Quicksilver 5-qt than a 5-qt jug of the Pennzoil I usually use. Thanks for the input!