Mercury Premium Plus and Quicksilver Premium Plus are the same product. They are both a synthetic blend. The Mercury Premium is a fossel oil. Mercury also makes a 2-stroke oil for the Optimax and the DFI. If you want to learn more about the Mercury Premium Plus, go over to the Stream and Fly Website. This oil is used by many high performance mechanics. The Yamaha and Evinrude/Johnson oil may be just as good and if I had these motors, would probably use that oil. I would only use a full synthetic if my RPM's were much greater, say over 7,000 RPM. The Mercury Premium Plus is used at 50 to 1 and this is extra protection for old or bad fuel, out of tune engines, etc. The oil is not cheap, but neither are outboards.
This from Jay Smith Racing:
"AHH the OLD oil debate AGAIN ! This is what I posted on Allison board years ago and IMO it has been bullet proof for me and my many customers:
IMO about oils:
First there are many great oils out there ( some better than others and most of that conclusion is strickly opinionated from hear say and not acutal hands on visual comparisons ) 99.9 % of ALL outboard failures are NOT oil related. I tear down, modify and build 1 to 3 engines a week with the every brand of oil thats sold used in them and I have came to several very apparent conclusions about whats good, better and best ( like Sears Roebuck advertised )
I have through research ( and observed failures first hand NOT hear say stories) come to the conclusion that steel sleeved engines live better on a blend, no matter who's blend.. Pen, Mercury ( Golden Spectro ) , etc...And a syn oil can be used on steel IF the ring thrust tention has lessoned so that the ring is not applying to much outboard thrust pressure to the bore ( OR TOTALLY BROKE IN )
Coated sleeved engines run and make MORE power on 100% syn oils after break - in on dino ( about 100 gallons of gas ran thru with the dino oil ) ( the reason Mercury doesn't suggest the running of a 100% syn oils in the race engines is THEY DON'T SELL OR OFFER ONE !!!!!.)
Certain oils that are designed to be recreational in nature should be used in engines turning 8000 or less rpms and under less stress. Anything turning over 8000 for extended run life at BIG rpms should use a specific oil for the stress and load those engines create.
As I said there are many good oils out there but always be careful listening to the "oil experts" most of the time there is a hidden agenda , THEY SELL IT AND MAKE A LIVING WITH YOU FOLLOWING THEIR SUGGESTIONS that results in AN OIL SALES and $$$ in their pocket.. I on the other hand don't make a dime on a drop of oil sales.
There are IMO two oils I have seen ran and litterly peel the chrome off the journal of a Mercury V-6 crank.Other than those two Bad Actors I don't think there are any TCW3 approved oils that would blow up a motor due to lack of quality,under recreational loads syn and or dino in make up , most outboards engines have way more reasons and causes for failure than oil quality...I'd say 99 to 1. Quanity or lack there of of oil takes many more out that quality..
Most of the time availability and price on recreational 2 cycle engine oil sales will always turn me toward Penn., or Mercury as they are always available at Wally World or most larger auto and sporting good outlets. IMO to ship a big $$ over kill oil for a recreational engine from miles away and eat not only the over kill price of the oil but the freight in these economic times is a bit ..... well your call. BUT if your stressing a motor over the protection of the "norm" by all means buy an oil to protect your investment.."
Another reason to use a synthetic blend over fully synthetic:
"The main reason is the steel bore engine I run the PP (Premium Plus). Its suposted to lubricate the steel beter than Synthetic from what Ive been told. Something to do with the porise nature of steel over Nic and other coatings being much smoother. Synthetic makes sence with a smooth finish over one with small pores. The PP blend holds in the pors longer for better lubrication. A few racer guys that build motors for a living have told me the same thing that I know and trust."
