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2009 Tacoma Rear Diff UOA Redline 75w90 27,890 mi #2938891
03/14/13 06:04 PM
03/14/13 06:04 PM
Joined: Mar 2010
Posts: 170
Wichita Falls, TX
86cutlass307 Offline OP
86cutlass307  Offline OP
Joined: Mar 2010
Posts: 170
Wichita Falls, TX
First sample for this Tacoma 2WD rear differential. Please comment as I need to understand better the lab's Phosphorus comment and Redline gear oil. Factory fill was changed at 11,376 miles. Total miles at sample time was 39,266. Flagged data was the phosphorus level. Viscosity seemed in line with Redline's data.

Lab comment - "Flagged data does not indicate an immediate need for maintenance action. Continue to observe the trend and monitor equipment and fluid conditions. Phosphorus is slightly high for this lubricant. Lubricant change acknowledged."

WEAR METALS (ppm)
Iron - 41
Chromium - 0
Nickel - 0
Aluminum - 0
Copper - 0
Lead - 0
Tin - 0
Cadmium - 0
Silver - 0
Vanadium - 0

CONTAMINANT METALS (ppm)
Silicon - 14
Sodium - 8
Potassiium - 0

MULTI-SOURCE METALS (ppm)
Titanium - 0
Moly - 1
Antimony - 0
Manganese - 0
Lithium - 0
Boron - 378

ADDITIVE METALS (ppm)
Magnesium - 0
Calcium - 15
Barium - 0
Phosphorus - 3002
Zinc - 11

Water - < .1 - Hotplate
Viscosity @ 100 C - 16.5
Acid Number - .60 mg KOH/g


2014 Honda Accord EX-L, CVT 4 cyl.
2009 Toyota Tacoma TRD Sport 4.0L
1986 Olds Cutlass Supreme Brougham-2nd owner (rust free)
Re: 2009 Tacoma Rear Diff UOA Redline 75w90 27,890 mi [Re: 86cutlass307] #2938940
03/14/13 06:43 PM
03/14/13 06:43 PM
Joined: Dec 2012
Posts: 117
NE
jegs Offline
jegs  Offline
Joined: Dec 2012
Posts: 117
NE
Phosphorus is part of the additive package in the oil. Since Redline is geared towards racing I'm not surprised it's slightly higher than other gear oil. Nothing to worry about. The wear metals look good. Your diff should live a long and happy life.

Re: 2009 Tacoma Rear Diff UOA Redline 75w90 27,890 mi [Re: 86cutlass307] #2939296
03/15/13 04:45 AM
03/15/13 04:45 AM
Joined: May 2007
Posts: 7,509
Indianapolis, IN
dnewton3 Offline
dnewton3  Offline
Joined: May 2007
Posts: 7,509
Indianapolis, IN
I hope to goodness you didn't OCI with this UOA, did you?

Generally, once you flush out the FF, gear lubes can stay in a long time; especially syn choices.


Overall it looks fine.

Last edited by dnewton3; 03/15/13 04:47 AM.

The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
Re: 2009 Tacoma Rear Diff UOA Redline 75w90 27,890 mi [Re: dnewton3] #2939301
03/15/13 05:03 AM
03/15/13 05:03 AM
Joined: Mar 2010
Posts: 170
Wichita Falls, TX
86cutlass307 Offline OP
86cutlass307  Offline OP
Joined: Mar 2010
Posts: 170
Wichita Falls, TX
I took the sample through the fill port using the trusty siphon tube; Redline is like gold. Anyway, lube still had its amber hue at this sampling so I was hoping to let it ride. I have had several long highway trips over the last couple of years and was curious how the gearset is beginning to age. Overall I'm pretty happy with the lab results. I'll say the silicon was due to the windy/dusty day in North Texas on sample day for my peace of mind. This differential and my driving habits seem to be a good match with this Redline lube. As said above, should live a long and happy life.


2014 Honda Accord EX-L, CVT 4 cyl.
2009 Toyota Tacoma TRD Sport 4.0L
1986 Olds Cutlass Supreme Brougham-2nd owner (rust free)
Re: 2009 Tacoma Rear Diff UOA Redline 75w90 27,890 mi [Re: 86cutlass307] #2939317
03/15/13 05:41 AM
03/15/13 05:41 AM
Joined: Jul 2006
Posts: 2,338
Magnolia, TX
INDYMAC Offline
INDYMAC  Offline
Joined: Jul 2006
Posts: 2,338
Magnolia, TX
Thanks for posting. This is the first RL 75W-90 UOA that I find inspiring. Did you top off after taking the sample?


2013 Toyota Tundra DC 4X4 5.7L FFV
2012 Toyota 4Runner 2WD SR5
2004 Honda S2000
Re: 2009 Tacoma Rear Diff UOA Redline 75w90 27,890 mi [Re: INDYMAC] #2939421
03/15/13 08:30 AM
03/15/13 08:30 AM
Joined: Mar 2010
Posts: 170
Wichita Falls, TX
86cutlass307 Offline OP
86cutlass307  Offline OP
Joined: Mar 2010
Posts: 170
Wichita Falls, TX
Yes, I let a few seconds worth drain out before the capture. I had some left over from the change back at 11K and just topped up. I tilted the axle ends to let the fluid level run down the tubes and stopped when the fill hole started a drip/run. Should be good for some time to come, seems stout for a street truck lube.


2014 Honda Accord EX-L, CVT 4 cyl.
2009 Toyota Tacoma TRD Sport 4.0L
1986 Olds Cutlass Supreme Brougham-2nd owner (rust free)
Re: 2009 Tacoma Rear Diff UOA Redline 75w90 27,890 mi [Re: 86cutlass307] #2939528
03/15/13 11:03 AM
03/15/13 11:03 AM
Joined: May 2007
Posts: 7,509
Indianapolis, IN
dnewton3 Offline
dnewton3  Offline
Joined: May 2007
Posts: 7,509
Indianapolis, IN
41ppm Fe is pretty low for a diff, but then your sample duration is also low, hence your wear/mile is fairly normal.

Great to hear this was a sample and not an OCI.

No reason not to continue this run!


The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
Re: 2009 Tacoma Rear Diff UOA Redline 75w90 27,890 mi [Re: 86cutlass307] #2939641
03/15/13 01:20 PM
03/15/13 01:20 PM
Joined: Jun 2002
Posts: 19,246
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,246
Iowegia - USA
I wouldn't worry too much about the silicon since RL uses about 8-15 ppm of silicon in their formulations.

The phosphorus is most likley part of the Sulfur-Phosphorus Extreme Presuure additive.


Reading is fundamental; understanding is not a given ability.
Re: 2009 Tacoma Rear Diff UOA Redline 75w90 27,890 mi [Re: 86cutlass307] #4675103
02/23/18 08:05 AM
02/23/18 08:05 AM
Joined: Jul 2008
Posts: 445
London, UK
Izb Offline
Izb  Offline
Joined: Jul 2008
Posts: 445
London, UK
What potential harm (for example for oil seals) can be from a high level of phosphorus?


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