Originally Posted By: Peted
Originally Posted By: NHHEMI
Just run 75W90 in both the front and rear diff's. No need to go 80W90 in the front. The OE 80W90 is conventional gear oil and is nothing special. 75W90 synthetic is an upgrade and should not cause any issues even with warranty as you are exceeding the OE fluid's spec's.
Amsoil Severe Gear 75W90 is a good product.
That's what I figured, good to know.
Originally Posted By: NHHEMI
The G80 out back is not picky about the fluid having FM in it so no worries there. I have had a couple Silverado's w/ the G80, including an 07 like your 09( new body style GMT900 ), and ran RP MaxGear in them which has FM in it and no issues. Ran RP MaxGear 75W90 in the front too.
Okay, that's some info I was looking for. Thanks for the input on your Silverado's w/ G80. I like MaxGear as well, had it in my rear diff for my Camaro and Max ATF in the transmission. Also ran RP front to rear in my Land Rover.
Originally Posted By: NHHEMI
For the trans just make sure whatever you run is compatible with Dexron VI. I assume Amsoil offers a transmission fluid that will work. Just be aware if you are still within your 5 yr/100k powertrain warranty a universal transmission fluid will not meet warranty requirements.
For the t-case see my response to daman above. GM used to use a special fluid called AutotrakII in the push button transfer cases. I have never seen an aftermarket replacement for it. JUst look in your owner's manual in the back under fluid spec's and capacities and it will tell you what to use. If it calls for ATII in your truck don't use anything but that stuff. If it is Dex VI then obviously use Dex VI.
Compatibly with Dexron VI is one of the reason's I'm going Amsoil this route. In the past I've ran RP in everything, but RP Max ATF may not be compatible with Dexron VI and does not meet the GM requirements. Read that right on the product page on RP.com "Max ATF is NOT recommended for the following applications: Allison TES-389, DEXRON® VI"
Yep, 1yr&4mo left on the warranty. Amsoil's site says it meets GM's spec. So all should be good here.
Originally Posted By: NHHEMI
No thoughts/opinions on the Amsoil air filter. Don't know anything about them. I will however say avoid using a filter that is oiled like the K&N. TONS of problems can crop up as the oil from the filter gets onto the MAF sensor which is right at the air box and it really plays havoc with the vehicle. GM has TSB's out about this situation. Use a dry filter even if it is a performance one. I speak from experience in having an oiled filter foul a MAF and then having gremlins take over my truck.
Talk to Pablo here on BITOG for the stuff you need as he really gives good deals to other members and is a good guy.
Agreed on the K&N, I've read plenty on that filter. Back before I knew any better I ran the K&N in my Land Rover, the oil ruined the MAF. Been there done that.
I usually try to run the OEM filter and just switch them out every 12-15K miles, or whenever they seem dirty.
Amasoil's EaA filter caught my eye, so I thought I would try it out. Can't be worse than OEM. Since it is cellulose + a layer of Synthetic.
Thanks again for your time and info. Cleared up some questions I had.
Yes, I know MaxATF does not meet Dex VI. I am an RP guy from way back and it is what I use when ever and where ever I can.
Unfortunately a universal fluid that meets many spec's does not qualify for warranty requirements even if your spec is one of them. If it is of ANY concern to you, while under warranty, use only a specific Dex VI fluid. A universal fluid from Amsoil that covers Dex VI is not warranty acceptable.
Not a bash on Amsoil products either as they are very good. Just a simple fact. I have worked dealer service myself and trust me that is a can of worms you don't want to open. Especially these days with all car mfg's really cracking down on this stuff. Now, with that said, with only a year to go and if you feel the trans is healthy and ok then you could use it. What are the chances of you having problems with the trans really? I am simply pointing out "IF" you did using a universal fluid just won't cut it where a specific one is called for "IF" you did have a trans failure.
GM is not going to care if you upgrade 80W90 to conventional to 75W90 synthetic( unless they specifically state not to )as it is still a 90W and it is a better product overall. However, they are going to care that you used a universal transmission fluid. At least in my experience.
If warranty is of any concern to you I personlly would not run the universal ATF from Amsoil( or RP, or Redline, or from anyone )until that warranty is up. I would grab some Valvoline Dex VI ATF and use that in the trans and t-case for this change. Next time swap to the Amsoil. The Valvoline Dex VI is very good stuff and is full synthetic. It was the popular choice on the GM truck forums for people still under warranty when I had my 07 Silverado.
http://www.valvoline.com/products/consum...ission-fluid/36
JMHO. Good luck with whatever you decide to do.
