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:

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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

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[ 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 144.5@40C and 21.0@100C. 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?