Merc4ever
Petty Officer 1st Class
- Joined
- Feb 14, 2009
- Messages
- 232
yes they do. Mercury part number [h=3]877770Q 1[/h]
You're right, and to no surprise it's twice the price of Wally worlds 50/50. Still when I look in my owners manual they push the Mercury brand oil by saying "we strongly recommend the use of Quicksilver 25W- 40 marine engine oil". I can get Mobil 1 25W-50 racing oil cheaper, and better IMO but that's another story. In the same owners manual they don't even mention the Quicksilver anti freeze they just say "a mixture of anti freeze".
My point being I still don't think it was a marketing push for dealers or a wives tale just a good, cheap, easy, idea to protect your most expensive part.