I"ve seen some threads on this but wanted to ask this question to more of specific scenario, i live in GA and its hot as crap here, i just got 4.77 gears on my diff and i know some whine comes with that and its about time to change the fluid from the break in period, now i was wondering of running 75w-90 would help or going with Amsoil severe gear 75w110? which is what most guys on here swear by... help please

 

any of those two is good. i personally use the amsoil severe gear 75-110 for my puddy mod diff.

 

How's your wine with that oil? And where are you located? Like how does it get?

 

definitely go with 75w110. I'm running 75w140 Amsoil in my stock diff in hot weather use and I find that it works quite well. Just my opinion.

 

the whine you can hear it with decel which is pretty normal. in located in tx

 

From reading the compiled oil logs it seems like even 75w-90 is too light. But i couldnt find any of that LE 607 stuff so i just went with Royal Purple 75w-90. If you live in a hot area, wouldn't you want it more thick?

 

I am using Amsoil Synthetic 80W-90 Gear Lube works great

 

The lighter weight should have better constant lubrication due to its weight. The heavier lube should have a better start-up protection due to the residuals and less "drip-away" when parked for extended periods of time. I'm pretty sure this is the reason for multi-weight oils and lubes to begin with. Which is better to use? I don't know.

 

IMO....for daily drivers,the 75-90 is just fine.For track use or in really hot climates,go with the 75-110.

I favor the Amsoil brand.I run the 75-90 in my 03S & 02Z06.

\rlr
carolina

 

Im running the Amsoil severe gear 75w-110 and its doing great so far! Gets pretty hot and humid in Tennessee also.