Royal Purple 75W90 Synthetic Gear Oil

[Bio-T]

This was left over gear oil from last summer. I filled the lower unit of one of my boats and left the bottle in my unheated garage, capped tightly. VOA done by Butler Cat Labs.

code:

---

               
Iron        1           
Chromium    0            
Lead        0
Copper      0                     
Tin         1         
Aluminum    2
Silver      1  
Boron       238           
Magnesium   1            
Calcium     43          
Phosphorus  2318           
Zinc        3           
Moly        139           
vis @100°C  17.5
ISO code    18/14

---

[ February 09, 2005, 09:47 AM: Message edited by: 59 Vetteman ]

 

[BlazerLT]

Nice dose of moly. Is this synthetic?

 

[Bio-T]

Yes this is a synthetic gear oil. I did change the title to reflect that. I am very happy with this oil in my lower unit on my boat. On my trucks I use the Royal Purple 75W140 Synthetic with no issues, and one has LS and no additive was required.

 

['03 EB/B Corvette Z06]

quote:

---

Originally posted by 59 Vetteman: This was left over gear oil from last summer. I filled the lower unit of one of my boats and left the bottle in my unheated garage, capped tightly. VOA done by Butler Cat Labs.

code:

---

               
Iron        1           
Chromium    0            
Lead        0
Copper      0                     
Tin         1         
Aluminum    2
Silver      1  
Boron       238           
Magnesium   1            
Calcium     43          
Phosphorus  2318           
Zinc        3           
Moly        139           
vis @100°C  17.5
ISO code    18/14

---

---

I use this in the rear of my '03 Z06. It works great and I didn't have to use any LS addititive.

 

[Rhymingmechanic]

Royal Purple's website lists viscosities of [email protected] and [email protected] That's pretty far off from this VOA and the published specs for other 75W-90 synthetics. Is this oil heavy enough to defeat some of the cold flow and supposed economy benefits of synthetic?