Thoughts on Royal Purple gear lube

[CurrentObsession]

Any experience/thoughts on using Royal Purple gear lube oil on a BIII outdrive?

 

[Bondo]

Re: Thoughts on Royal Purple gear lube

Any experience/thoughts on using Royal Purple gear lube oil on a BIII outdrive?

Ayuh,... You can use any color drive oil ya want,...

I use honey golden Mobil 1, 75W-90 in mine...

 

[90stingray]

Re: Thoughts on Royal Purple gear lube

I use the quicksilver high performance 90wt. Do you use royal purple in anything else you own? Otherwise, what's the appeal?

 

[CurrentObsession]

I guess this is what is swaying me to RP:

http://www.boattest.com/Resources/view_news.aspx?NewsID=3844

http://www.boattest.com/products/Product-test.aspx?id=27

 

[HT32BSX115]

Re: Thoughts on Royal Purple gear lube

I just knew I couldn't stay away from this thread!!!

I guess this is what is swaying me to RP:

http://www.boattest.com/Resources/view_news.aspx?NewsID=3844

http://www.boattest.com/products/Product-test.aspx?id=27

Howdy,


This year I switched to Amsoil Marine gear lubricant. I only chose it because it is very convenient to obtain (local Napa store vs driving an hour to get the Merc HP)

Both are synthetic gear oil. Both claim to NOT lose lubricating capability if contaminated with 10% water.

• Excellent Gear and Bearing Protection even when contaminated with 10% water

Even though Mobil 1 doesn't make this claim, I would be willing to bet that it meets the same water contamination requirement.

I noted that the Royal Purp test did NOT make comparisons to other synthetic oils, they only compared it to NON-synthetics.

It is WELL documented that synthetic gear oils do NOT place nearly as much drag on a gear train (when cold) as do single grade NON-synthetics.

Several years ago I switched a VW 4 speed gear box from non-syn to Mobil1 gear oil.

In the winter time I could BARELY shift it into and out of gear when the temps were well below freezing. After I put Mobil-1 Synthetic in it, it shifted in single digit temps like it did in summer time!!

There is NO DOUBT that using Royal Purple in your drive will be "better" than using other NON-synthetics.

I also have NO DOUBT that it'll be no different than using Merc HP, Mobil-1, Amsoil, Volvo Penta Synthetic gear lube, or ANY other synthetic gear lubricant!

Knock yourself out!!


Cheers,


Rick

 

[HT32BSX115]

Re: Thoughts on Royal Purple gear lube

Hmm. I went back and re-read what they said about RP's ability to separate and demulsify in 20 min...

http://www.boattest.com/resources/view_News.aspx?NewsID=3511

The faster gear oil can separate from water, the faster it can start protecting your gears. This test shows that after only 20 minutes Royal Purple Max Gear was completely separated from water and after 60 minutes conventional oils were still partially emulsified.

Royal Purple MAX Gear in an automotive differential could be a "good" thing because there's some "room' between the bottom of the ring gear and the bottom of the housing.

Having a little "level" of water in the bottom wouldn't really hurt anything.

BUT there is NO sump in a stern drive. There's no place for that level of water to be that doesn't touch some part of the drive gears/dogs/bearings and as such, you wouldn't want the water separating from the oil in 20 min..........because that would put a water line possibly above your entire lower unit! certainly into the lower propshaft/cone clutch/gears/etc.......

No one would ever want or plan on having water contamination in their lower unit. Spending a few extra dollars for the extra protection from a high quality gear oil is likely worth the peace of mind.

Mercury, Amsoil, and others actually test their gear oil with 10% water contamination.....THEY KNOW IT'S GONNA HAPPEN!.......... they DO NOT want the oil to separate (or DE-mulsify )


Royal Purple MAX Gear says right on the bottle that it's a "High Performance Automotive Gear oil".


I would use it in an automotive application. NOT in a sterndrive.



ymmv//R