What is the proper lower unit lubricant for my 1977 in-line 115 hp. Merc?<br /><br />The guy I bought it from gave me some "Premium Blend". The book calls for "Super-Duty" and the store I go to sell "High Performance Gear Lube" The bottles indicate not to mix. <br /><br />Can any be used as long as it is not mixed?<br /><br />Bob
