jyeung528

Van nuts is local, I will go pick it up, thanks!

Did you have a similar vibration issue or similar metal shavings issue?

redlineracing

I run 75w110 in my 03S and 02Z.Just a little more protection in the NC/SC summer heat.I change mine( and diff fluid) every 15k or once a year.Just part of my service routine.

\rlr
Carolina

slipstream444

I'm beginning to believe there is a compatibility issue between Amsoil and LE. My personal experience was similar - but the other way around.

I switched from Amsoil Series 2000 (predecessor of Severe Gear) to the second iteration of LE (this is back in 2005 in my second built diff) and what was normally a clean drain (Amsoil) turned very dark with lots of trash on the mag drain plug after less than 1000 miles. I was convinced LE was garbage after that. However, I don't think this is the case any longer due to the fact I have read a few posts where people have either gone from Amsoil to LE - or the other way - and the result was problematic. I have run nothing but Amsoil in my current diff and the drains show clean/normal service. I think redlineracing is correct in his assessment that the additive packages in the two brands are not very compatible which is leading to excessive wear.

My suggestion based on this theory is that if you're running LE - don't switch to Amsoil; and if you're running Amsoil - don't switch to LE. And if you decide to do it anyway - make sure you flush the diff thoroughly before you do.

I can't speak to what exactly is happening to cause the problems, but it appears there is a compatibility problem. I am going to contact Amsoil tech services to see what the issue might be.

I would caution anyone with even the slightest suspicion that you have a failing or malfunctioning drivetrain component (such as a diff in this case) to sample the fluid in order to help determine what the issue might be. If there's an issue with the gear oil and you're using Amsoil - they will replace or repair damaged components when that damage is due to an oil related failure. This (of course) only works when you are using a clean fill (little to no residual old oil - and hence why I always recommend and use a short service interval following a switch to a new product to minimize old/residual fluid). If you don't sample the fluid - there is no way to determine if any issues are compatibility related, oil related, component failure and/or abuse related.

SpitfireS

The Duolec EP additive in LE1605 is a chemical additive, right?
Not like the LE-607 Almasol, that was a solid film additive.

jyeung528

i drained the valvoline syn-blend 85w140 and the shavings were smaller than the amsoil 75w110.

put some le-1605 back in, and the car drives smoother, and the vibration at light throttle at the 70-80 mph range seems to be reduced in intensity by about 50%.

my next step is to try le-1606 140w, and see if that suppresses more of the vibration.

jyeung528

you've got me thinking to try a diff additive product like slip lock from amsoil.

or even using there severe gear 190w and adding slip lock additive.

i think i will try the 190w with slip lock additive.

jyeung528

my vibration was due to the nut in the middle of the differential flange being loose. tightened it, now it's smooth as butter.

apologies for blaming Amsoil. now I need to return the amsoil 190 and slip lock additives that I just bought.

jyeung528

fwiw, i put in amsoil straight 190w with some of the slip-lock additive.

while turning, i notice more rear wheel rotation, more oversteer tendency.

i like it.