thereisnospoon

I am going to be changing over to synthetic (finally hit 10K) and I am trying to decide if I should drain and refill my rear diff again at the same time. I last drained after about 3K miles on redline 75w90 and it was in bad shape and had lots of powdered metal on the drain plug (this is when I switched to LE - about 4K miles ago). My gearbox oil (redline mt-90) was fine when checked at the same time interval - nice and clear - looked brand new.

Just curious if anyone that has switched to the LE stuff has subsequently drained and has any input in terms of the condition of the fluid after X number of miles. Also - should it still be purple?

thereisnospoon

Let me add this:

I know RR has suggested that LE-607 can go 30k between changes. The reason I am itching to drain early is because of the condition of the redline fluid/drain plug after only a few thousand miles. I guess that I would like to hear from someone who has found that the LE looks like new when drained out afer a few thousand miles. I have no problem leaving the fluid in for 15 or 30K miles - but i'd like to know that its actually working better than the redline fluid I had in there.

gsp

Same question,

I have 5K on the LE-607 after 10K on RedLine.

When I dumped the RedLine it was clean and no metal after 10K miles.

Road Rage

I cannot answer as I do not plan to dump mine after only 800 miles. But you will see some metal as the car continues to break-in - without knowing your car's history I cannot comment, other than to say that while looking at the magent is intersting, and huge chunks are a yellow flag, the best way is to do a baseline UOA, then subsequent UOA's. I too am interested in our getting a good knowledge base of all these fluids, so I pldege to do a UOA, post the mileage on it, and then we can start to get somewhere even remotely close to some real science (epidemiology of our S2K's in a manner of thought).

So please, everyone, if you want to do your part:

1) Drain your fluids after a warm shutdown, and after the lube flow has been a few seconds. Collect it in a clean analysis container and seal it immediately. Note your car's mileage and notify the lab of the fluid's name and viscosity. TBN ids not needed for diff and tranny, nut is for engine.

2) Post your results in a way that makes for easy searching:
"Lubrication Engineers, 90w, 10,000 miles"

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rlaifatt

Replaced my LE607 a few weeks ago after around 3,000 miles (9K to 12K), because at least a quarter of those miles were hard track miles. I recall that it looked the same dark red color and there was little metal powder on the magnet.

Asura

I replaced mine after 1000 miles as I had to have a seal replaced in the diff. It still looked like Robitussin with subtle undertones of oak and cinnamon. I am picking up some more in a few days. I will give it 3-5K miles of abuse, and send it in for analysis.

Big thanks to RR..