[QUOTE]Originally posted by Road Rage

 

 

[QUOTE]Originally posted by Destiny2002
Here's a copy of part of a post I placed on the bobistheoilguy forum:

The most interesting thing is that it's been reported that lower CASE temperatures are a result of LE-607. This either means there is less circulation of heat to the case because of how thick and sticky it is, or that it is incredible at reducing temperature. If it's the latter it could be incredible jump in reliability for the S2000 differential. If it's the former, it could actually increase the heat to the components, leading to premature failure.

Since the only way a differential can reject heat is through the shaft or through the case, I think it's very important to understand whether or not there is full circulation of fluid through the case. The circulation of oil is probably a better carrier of heat to the case than direct conduction through stangnant oil.

For those who don't quite understand what I mean, consider a blender churning molasses-thick oil in the middle of a bowl.

 

[QUOTE]Originally posted by shingles

 

My first thought is that the LE607 is reducing friction which would cause less heat to be produced, but it would be good to know for sure.

I still would like more info on the flushing of the old fluid prior to putting in the LE607, if anyone can help.

Thanks,
john

 

A 75w90 will never have the vis of a pure 90 weight, and is subject to shearing. I thought I covered that in the opening post of this thread - I also covered the flushing - shoot some critus-based brake cleaner in there and let it drip, or some 5w20 engine oil in there with the drain plug in place, spin the wheels manually for a while, then let the engine oil drain out.

The LE-607 circulates - there is no dubt about it.

You really need to read all the threads - otherwise we keep covering old ground.

 

[QUOTE]Originally posted by gernby
I guess I missed something... Why do we need to flush out the old oil before adding LE607?

 

So, what oil would you recommend for our diff?

 

John, I usually drain the diff after I've gone for a good drive. This way, the old fluid will flow well due to being hot and most of it will fall out. Whatever is left is not a big concern as all diff fluids should have the same designation (GL-5) and shouldn't become a chemical bomb, especially with what's left after a hot drain.
If you are truly compulsive/obsessive, then get 2 bottles of juice. Put one in, drive around till it gets hot, drain and fill again and you should be good to go.
WD-40 might be a good flushing agent but what you get from a spray won't reach all the bits and I wouldn't want to drive around with a diff FULL of WD-40 (assuming you keep spraying it in till you fill the thing). I'd rather had a "bit" of old diff fluid than a bit of WD-40 that didn't come out.