I'm running a 500 hp and I'm replacing the fuel pump cam and shaft body which the pump bolts to. There is a oil reservoir which the cam and fuel pump arm lives in. What type of oil does Mercury recommend to run in there. A gear lube or a engine oil plus what W ?????
Thanks.

I'm told the good lower unit lube is what they put in there.

MAV

I can check the manual if you are concerned.

Maverick,
If you have the manual I would appreciate it.
Thanks.

I'll check. The manual is at home.

I'll let you know -- probably tuesday.

MAV

hi performance gear lube,

Thanks guy's for the info.
Have a good 4th.

I had both pumps replaced at 300 hours. One started to leak a small amount of fuel into the oil.

My mechanic switched the Merc Syn OD Oil with Amsoil Gear Lube.

Jeff

I would stay with the Merc hi pro grea lube as if there is a small water leak from the water pump the merc is suposed to hold it.with anything else it will go to the bottom and shoot the bearings.Drain into a cup check for water and refill every season.