Mercruiser vs Quicksilver inboard 25-40 weight oil comparison

[Pseudomind]

Has anyone on CSR tried these two for a comparison test with there inboards? If so what is your opinion?

Thanks

 

[dc380]

I'm not sure why but Mercury markets their products under both names. Mercury and Quicksilver. Same product, different packaging.

Stores tend to carry Quicksilver, whereas Marina carry Mercury.

Buy either, you can't go wrong. By the way, are you going to switch the the synthetic blend? It's now recommended by Merc.

 

[Morpheus]

http://www.mercurymarine.com/serviceandwarranty/mercruiserfaqs/fueloil.php#1124

 

[Pseudomind]

I'm not sure why but Mercury markets their products under both names. Mercury and Quicksilver. Same product, different packaging.

Stores tend to carry Quicksilver, whereas Marina carry Mercury.

Buy either, you can't go wrong. By the way, are you going to switch the the synthetic blend? It's now recommended by Merc.

I will be looking into it, what have you done? I have heard that if piston tolerances are worn a bit and you go to some synthetic oils, you may see problems. I am not a mechanic so I do not know. Has something to do with the molecular size of the oil?:huh:

 

[dc380]

I also have heard mechanics say to stick with the 25-40 conventional oil, and just change it a 60 hours.

So I plan to continue with conventional oil.

 

[Jersey Mike]

I will be looking into it, what have you done? I have heard that if piston tolerances are worn a bit and you go to some synthetic oils, you may see problems. I am not a mechanic so I do not know. Has something to do with the molecular size of the oil?:huh:

Your mechanic may be (partially) correct. I am a fan of sythetic oils. But, my experiences with customers and my own cars that switching to the same weight oil in a synthetic sometimes amplifies valve train and other noises. Castrol oil told me that even though the viscosities are the same the synthetic is thinner but more stable(something to do with the conditions that the viscosity is tested at). That being said I switched to MM synthetic blend last oil change and have experienced lower oil pressure hot/at idle than with conventional MM 25-40.

 

[Woody]

I'm not sure why but Mercury markets their products under both names. Mercury and Quicksilver. Same product, different packaging.

Stores tend to carry Quicksilver, whereas Marina carry Mercury.

Buy either, you can't go wrong. By the way, are you going to switch the the synthetic blend? It's now recommended by Merc.

You saying that Merc recommends we switch to synthetic?

 

[dc380]

I'm not a mechanic.

I read the recommendation from Mercs website.

What type of oil should I use? Can I use synthetic oil?

Engine Oil
To help obtain optimum engine performance and to provide maximum protection, we strongly recommend the use of the following oils listed in the order of recommendation:

1. MerCruiser / Quicksilver Synthetic Blend, NMMA FC-W rated, 4 cycle oil.
2. MerCruiser / Quicksilver 25W40 NMMA FC-W rated oil.
3. A NMMA FC-W rated oil.
4. MerCruiser / Quicksilver 4-cycle 25W40, non FC-W rated oil.
5. A good grade straight weight detergent automotive oil per the operating chart below.

This is from www.mercurymarine.com

Notice that the Synthetic blend is now recommendated over the conventional. The link is below.

http://northamerica.mercurymarine.com/serviceandwarranty/mercruiserfaqs/fueloil.php

 

[Pseudomind]

I read this and their 25-40 weight oil is still there as the second recommendation.

I read this, but manufactures are still in the parts business. I would like to see a bit more testing literature about using number one over number two recommended. :huh:

 

[Woody]

I thought he meant something new was recommended by Merc..change to synthetic, but that clearly isn't the case.

 

[fc3]

Merc's synthetic isn't a full synthetic. It's a blend of synthetic and mineral. The proportions are proprietary. Is it worth the additional cost? Darned if anyone outside Merc and the vendor who blends the stuff knows.

If you really want to run a full synthetic, then you'll have to look elsewhere. Here's an elsewhere. It's the list of oils certified FC-W.

 

[Pseudomind]

I'm not a mechanic.

I read the recommendation from Mercs website.

What type of oil should I use? Can I use synthetic oil?

Engine Oil
To help obtain optimum engine performance and to provide maximum protection, we strongly recommend the use of the following oils listed in the order of recommendation:

1. MerCruiser / Quicksilver Synthetic Blend, NMMA FC-W rated, 4 cycle oil.
2. MerCruiser / Quicksilver 25W40 NMMA FC-W rated oil.
3. A NMMA FC-W rated oil.
4. MerCruiser / Quicksilver 4-cycle 25W40, non FC-W rated oil.
5. A good grade straight weight detergent automotive oil per the operating chart below.

This is from www.mercurymarine.com

Notice that the Synthetic blend is now recommendated over the conventional. The link is below.

http://northamerica.mercurymarine.com/serviceandwarranty/mercruiserfaqs/fueloil.php

I thought he meant something new was recommended by Merc..change to synthetic, but that clearly isn't the case.

If you follow their chart the do recommend the synthetic over the other;

"we strongly recommend the use of the following oils ...listed in the order of recommendation:

1. MerCruiser / Quicksilver Synthetic Blend, NMMA FC-W rated, 4 cycle oil.
2. MerCruiser / Quicksilver 25W40 NMMA FC-W rated oil"

From the same MerCruiser recommendation link;

This crankcase oil recommendation supersedes all previously printed crankcase oil recommendations for MerCruiser gasoline engines. The reason for this change is to include the newer engine oils that are now available in the recommendation.


Older owner manuals, service manuals and other publications that are not regularly updated will not be revised to show this latest engine oil recommendation. Current owners manuals, service manuals and other service publications that receive regular updates will receive this revised recommendation the next time they are updated.