Changed the oil and filter on my 150 SHO this morning and thought I'd pass along the " how to " in case some of you might want to do it yourself instead of taking to a dealer. I bought an OEM oil change kit for $68.12 on Ebay which included 5 qts Yamalube 20-40 oil and filter. You'll need a couple things to do it properly including a 14mm socket and ext, , a drain hose and I/2" nipple and a filter wrench. The 1/2" nipple is actually a nipple used to splice a water hose and can be bought at Home Depot. The drain hose is any hose that fits the nipple, I used a piece of old fuel line. Pictures provided. The operation is simple and takes less than 20 minutes if you follow the steps properly and in order.
1- remove cowling
2- remove dipstick, oil filler cap and oil filter
3- tilt motor as far up as possible
4- remove drain plug ( pic provided showing location of drain plug )
5- insert nipple with hose attached in drain plug hole- pics provided
6- have a container handy that will hold 4 1/2 quarts of oil and insert hose in container
7- lower motor gradually so that oil starts to drain in container
8- after oil has drained tilt motor up again, remove drain hose and re-install drain plug
9-lower motor and install new filter
10- using paper funnel provided in the oil change kit pour in 4 qts. of Yamalube 20-40 oil
11- with motor at level position check oil, should be between the two dipstick marks. I usually add about a 3rd of a quart more.
12- I recommend checking oil level again after running the motor for 10-15 minutes
Don't know what dealers charge to change oil and filter but was told $250 so for you do it yourself' guys this can save a few bucks
drain plug location