Cadman, to the best of my knowledge, I don't know of an automobile manufacture in the US that sells a vehicle with a two stroke motor in it, but if they did, I would recommend running their oil. This topic was about two stroke oil, not four stroke, two totally different engines and the way the oil is used in them.

Ever seen the heads off an oil burning four stroke car engine, usually one big carbon mess. That's what the inside of a two stroke looks like that's been run on a lot of these cheap TWC-3 oils sold for two strokes. Also, the most of the two strokes built of the past decade have a very sophisticate oil injection system and a small change in the oils viscosity make a huge change in the engines oiling system.

Like I said though, I could absolutely, 100%, tee totally care less what anyone runs in their motors, I just know I've been building and racing outboards since the late 60's and have seen the inside of a whole lot of engines, so I know what I will run in mine, and it won't any of those bargain brands. In my DFI motors, I will only run the manufactures oil because of the oil injection and the viscosity it's tuned for.

I appreciate your experience and inside information.

Thanks.

Mixing quicksilver DFI oil and mercury DFI oil won't have any impact will it? 

no

K

I use XD 50 too in my 90' 30 HP Evinrude and my 02' 115 HPJohnson.  No complaints.  I actually get the small bottles that treat 6 gallons at a time.  I never use more than that in a trip.  It's just convenient for the small motor and big boat.  Two days 12 gallons at the pump and 2 bottles (3.29 at wally world).  One day in small boat gets 2 gallons and 5 oz.