My mercury 2 stroke Premium plus oil is up to $40 a gallon. I see some stuff at Walmart for $12.96 that is tcw3 rated. Anybody else using that. I cant rember the brand name.
http://www.thehulltruth.com/archive/t-30160.htmlThere's been a few posts here and there lately about TCW-3 oil ... why some is $6/gallon and others $17/gallon. Not intending to start a flame ... but to simply to educate people, here are some facts on the TCW-3 rating/certification:
Not all TCW-3 oil is the same. Most important to remember is that the TCW rating is a MINIMUM standard. The oil quality can be better, in fact significantly better, like that which the OB mfg'rs market.
Standard TCW-3 testing for this oil accepts up to 14% piston scuffing while carbon inhibitors must be 8 to 12% of the total oil mix by volume.
FWIW, for the premium blends sold by Bombardier, Mercury, Yamaha, Suzuki, etc. must pass their own proprietary higher standards. Typical specs from the premium blends are 0% piston scuffing while carbon inhibitors must be 12 to 24% of the total oil mix by volume.
That said ... not all OBs, even the same brand and consecutive serial numbers, will exhibit carbon coking the same. There are way too many variables, i.e., finish of the castings, load, use, prop pitch, duty cycle, etc., so I'm not going to comment on what people should use ... just illustrating some facts about these oils.
We report ... you decide ...
There's a reason its ten years old and never had a problem so I believe you've answered your own question. As mentioned if it aint broke dont fix it.It's a 75 hp merc 10 years old bought it new and never had a problem with it (knock on wood). Always used premium plus. Maybe I should leave well enough alone.