A friend of mine called me today. He bought a used boat with a 115 Suzuki 4 stroke on it. He’s going to change the oil and asked me what my thoughts were about the brand of oil to use, Suzuki or is it ok to use Mobil-1. I told him I would post the question here. So what are all your thoughts on this? 
just use a good oil doesnt have to be suzuki or even mobil-1
Been running a 90 4 stroke Suzuki since 2002 and switched it over to synthetic after the 2nd oil change. (Engine was just checked out at the shop and, at 780 hours, is running 100%.) Used Amsoil 4 stroke outboard oil until the price went through the roof(!) Switched to Mobil 1 2 seasons ago and I am now using Suzuki’s, new this spring, 4 stroke synthetic. Not sure if synthetic is the end all but I use it for peace of mind due to the high rpms these engines run at. Other option would be to find a source for Suzuki’s standard 4 stroke oil which is reasonably priced for “marine” oil.
And make sure he picks up a few of the aluminum drain seals.
Good luck, great motor!
I have a 2006, 115 hp Johnson four stroke (just a Suzuki painted white) and the owners manual says to use the Johnson brand synthetic blend (can’t remember the oil weight at this time). I don’t know why they recommend a synthetic blend over a full synthetic motor oil.
Boone
Quote:
I don’t know why they recommend a synthetic blend over a full synthetic motor oil.
Boone
More $ in their pocket! I have a Merc Optimax and once my holding tank is about for a refill I’m moving to Amsoil.
Amsoil for me….
Thanks,
I will let him know what you all have said.
Yep. Just good oil. But be consistent in your choice. Either pick dyno and stick with it or synthetic. I have used Mobil 1 in my 40 hp for 5 years. No probs and I run it many hours with one change in the fall.
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