Re: How do I change the oil in the bottom end of my Chrysler 15hp outboard?[Aluminum Boat and Repair Board ] [F A Q ] Posted byMajor (64.12.103.49) on April 10, 2002 at 21:24:59: In Reply to:How do I change the oil in the bottom end of my Chrysler 15hp outboard? posted by Fathead on April 10, 2002 at 17:48:14: If you look on the lower unit you will see a drain plug and a vent plug. unscrew the lower drain plug first the unscrew the vent plug. after all oil is drained look at it and see if it looks like a lightish tan if so water is getting into the lower unit and must be resealed. If it looks like dark oil the refill from the bottom hole up until it comes out the top hole while the tube is still in lower hole screw in the top plug first then remove tube and quickly replace lower plug. You can get lower unit oil at any wal-mart or boat store. If you have any questions feel free to email.
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