03 Mercury 90hp 4 stroke ..how often do i Change the oil

[MistahBiz]

I got my new motor sept 1st.. I have probably gone fishing twice a week since then..how often do i change the oil? Also how often do i change the oil in my trim/tilt? Any suggestions would be greatly appreciated..I plan on changing the oil myself so any recommendations... thanks in advance.

Mistahbiz in Cali!

 

[SparkieBoat]

Re: 03 Mercury 90hp 4 stroke ..how often do i Change the oil

I think the manufacturer recommends oil change every 100 hours. I do mine every 50. or at least once per year..you need to call a dealer and confirm for your motor. you are due...my idea is if I wonder if it needs an oil change..I change it anyway.

 

[Ldavidgrover]

Re: 03 Mercury 90hp 4 stroke ..how often do i Change the oil

Every 100 hours or once a year. Also you want to chance or inspect your zinc around the same time

 

[jerryjerry05]

Re: 03 Mercury 90hp 4 stroke ..how often do i Change the oil

Don't touch the T/T!!
If there is a leak then check for water in the oil.
Otherwise don't mess with it.
The pump/motor could run for months straight before the oil would need changing.
The seal on the shafts can be lubed.I use a bit of waterproof white lithium grease.
The lower unit:I check the oil on a regular basis.Every 2-3 trips I check for water.
I change it every 50-60 hrs.I boat in the Atlantic and salt here seems to be worse than some other areas.(maybe that's just me)

 

[MistahBiz]

Re: 03 Mercury 90hp 4 stroke ..how often do i Change the oil

Thanks guys!