I had a Mercury Optimax rebuilt back in 2019-2020 during covid. The Mercury dealer that rebuilt the engine had told me that Quicksilver Premium Plus synthetic was good for that engine. Later, I found out that the Optimax requires DFI oil, so I began running Mercury DFI synthetic blend oil. The engine runs great. Little to no smoke, idles great, and performs well. It performed well on the Quicksilver Plus synthetic blend oil too. But since I've switched to the DFI oil, I have some of the other oil in sealed jugs left over. My question is, can I mix these two oils together to use up the Premium Plus synthetic blend oil without causing harm to my Optimax? I do realize that mixing generally is thought to not be a good idea.
One other question regarding the Optimax DFI oil, SHOULD THERE NOT BE ANY SEPARATION within an unopen gallon of Mercury's DFI oil. I opened a gallon today and began pouring the oil into my oil tank. The I thought than there was something in the fresh gallon of oil when I was pouring it into the funnel. I stopped, changed to a funnel with a screen in it, which captures some amber colored globules which were soft. I shook the balance of the oil that was left in the jug, then poured some more into the funnel with the screen. Globules appear to be gone and have mixed/dissolved back into the remaining oil. The DFI oil has been sitting on my shelf probably around 2 years since I bought it. The jug was sealed when I opened it so I doubt anything was added to it since purchase. So, can I mix these two oils? And should I scrap the oil that is separated or just make sure I shake it up well? I'd like to hear some thoughts on these two things. Thank you ahead of time.
One other question regarding the Optimax DFI oil, SHOULD THERE NOT BE ANY SEPARATION within an unopen gallon of Mercury's DFI oil. I opened a gallon today and began pouring the oil into my oil tank. The I thought than there was something in the fresh gallon of oil when I was pouring it into the funnel. I stopped, changed to a funnel with a screen in it, which captures some amber colored globules which were soft. I shook the balance of the oil that was left in the jug, then poured some more into the funnel with the screen. Globules appear to be gone and have mixed/dissolved back into the remaining oil. The DFI oil has been sitting on my shelf probably around 2 years since I bought it. The jug was sealed when I opened it so I doubt anything was added to it since purchase. So, can I mix these two oils? And should I scrap the oil that is separated or just make sure I shake it up well? I'd like to hear some thoughts on these two things. Thank you ahead of time.
