Amsoil 75W90 Synthetic in the differential
#131
Registered User
Did you have a similar vibration issue or similar metal shavings issue?
#132
Registered User
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
\rlr
Carolina
#133
In case anyone is interested, I flushed out the Amsoil 75w110 last night after only 150 miles or one day of driving. Saw some metal shavings that were bigger than I every had with when using LE 1605. I couldn't find any 1605 locally, and ricks2k.com is selling one quart of LE 1605 for $42?! I don't recall it being this expensive, but now I remember this might be the reason I switched to Amsoil.
So, I went to Autozone and purchased a quart of Valvoline Syn-blend 85w140. The vibration is still there, and the car definitely feels more sluggish.
At this point, I am going to conclude that it is differential damage (backlash, chipped gears, etc.) It got worse/more apparent after switching from LE-1605 (for 10 years, 200,000 miles) to Amsoil 75w110 recently. So I'm thinking the damage is done and just trying to prevent further damage.
I would like to put LE 1605 back in my diff and see if that gets rid of the vibration issue, but at $42 a bottle, I just can't get myself to spend that much on one quart of gear oil to test and see if it improves the vibration.
If anyone paid less for their LE 1605 ($20 range?), I would gladly pay you for that bottle so I can test it out again.
So, I went to Autozone and purchased a quart of Valvoline Syn-blend 85w140. The vibration is still there, and the car definitely feels more sluggish.
At this point, I am going to conclude that it is differential damage (backlash, chipped gears, etc.) It got worse/more apparent after switching from LE-1605 (for 10 years, 200,000 miles) to Amsoil 75w110 recently. So I'm thinking the damage is done and just trying to prevent further damage.
I would like to put LE 1605 back in my diff and see if that gets rid of the vibration issue, but at $42 a bottle, I just can't get myself to spend that much on one quart of gear oil to test and see if it improves the vibration.
If anyone paid less for their LE 1605 ($20 range?), I would gladly pay you for that bottle so I can test it out again.
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.
#135
Registered User
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.
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.
#136
Registered User
or even using there severe gear 190w and adding slip lock additive.
i think i will try the 190w with slip lock additive.
#137
Registered User
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.
apologies for blaming Amsoil. now I need to return the amsoil 190 and slip lock additives that I just bought.
#138
Registered User
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.
while turning, i notice more rear wheel rotation, more oversteer tendency.
i like it.
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