I know I have saw this discussed before on the board but I aint havin no

[jimp]

As long as it meets the mfg'rs specs, any oil will do. Merc probably does not have an oil refinery, so someone else makes their oil for 'em to their specs. I have an 04 Merc 60 2smoke, and have used quicksilver since new until late last year when I bought some Pennzoil.

[SeaRay]

I'll share this for what it's worth. I took an outboard engine repair course back in the late 70s taught by a BIA certified instructor. I had a nearly new 4.5 HP Mercury engine.It ran like a top but was hard to start first time each trip. Had to pul and pull to get it started. After that it started with one quick pull all day.
I took it to the class and we checked everything from top to bottom and it was up to specs. Instructor asked me what kind or oil I used and I told him I bought it at gas stations, probably Penn or similar brand. He told me to switch over to QuickSilver oil which I did. After I had run all the old gas out it started cranking on the first pull every time, hot or cold.
Made a believer out of me and I have run Quick Silver ever since, even in the Johnson 35 HP that I ran for 20 years.
Does it make any difference today?? Can't say, but I just buy the gallon of QuickSilver and it last me a long time. I don't have a big outboard so I don't use a lot so the cost is not too big a deal.

[prefers shiners]

Quicksilver is good oil.....been around a long time......I don't think it is good to switch oil on any engine.....

[maachuu]

Thanks to all, just went ahead and bought me more of the Quicksilver, ifn it aint broke, don't worry bout fixin it