Oil question

[tmors424]

Hey folks- looking for opinions. I changed my oil today during winterizing. i have a 99 215 Express with a carborated 305. I have been using Quicksilver sinthetic blend 25w40. I mistakenly bought a gallon of 25w50 and a quart of 25w40. So now I have 4 quarts of 25w50 and 1quart of 25w40 in the boat now. I didn't realize until after the job was completed I mixed the oil weights. Should I just run it in the spring or should I change it? Pressure seamed fine when I ran it on the hose and muffs. :huh:

 

[BillK2632]

Mixing 1qt with the 4 should not cause a problem - the difference between 40/50 is minimal. I have done that and even mixed 1qt of Dino with synthetic blend - not regularly but to use up an odd qt. I guess my question is are these both Mercury oils? I thought all their 4 cycle oil was 25w40?

 

[Air O'Nautical]

I wouldn't worry about it.

 

[boltman]

So what I'm hearing is you have 25w46 in your boat , I think you're ok no worries .


Boltman

 

[tmors424]

I am no math wizard but that's a good one!

 

[bbwhitejr]

I am like Bill...if they are not both Merc oils, I would change and I did not know Merc made a 25w-50. It likely would be OK, but if different oils, it would bug me....

Bennett

 

[tmors424]

Yes, they are both Quicksilver synthetic blends. The 25W50 gallon container looks exactly like the 25W40 which is why I mistakingly picked it up and used it. On the back label its says its formulated for high performance engines (which my little old 305 is far from). I always thought even the 25W40 was a heavy viscosity so, 50 weight had me even more concerned. i just don't want to starve the valve train, cam, and lifters with a more heavy viscosity oil than necessary. I guess it will be fine. I am just gonna run it in the spring.