Elrick

after doing a search I decided to change the trans fluid in my LT4. I was going to use the amsoil synchromesh but I couldn't find it at any local parts stores. I ended up getting royal purple synchromax. anyone use this? Is this okay to use and where is everyone finding the amsoil? Thanks

cv67

Amsoil dealer


http://forums.corvetteforum.com/memb...subdriver.html

WVZR-1

A Royal Purple application catalog calls for HPS 10W-30 as a service for GM 1052931 the original fluid. It does NOT call for Syncromax. Will it be fine? I'm sure you're not the first!

RollaMo-LT4

I am not sure if any parts stores sell Amsoil. I've never found.
Buy it online and get it in a day or two.

dizwiz24

Amsoil is the better stuff.

Royal purple is like 'Blue Rhino' brand propane.

Same as regular natural gas. but you pay more for the color and advertising logos.

Elrick

The local parts guy tried to really push Redline MTL. He said it's way better than amsoil. It was $17 a quart. I think I'll be ordering the amsoil. thanks for the responses

RollaMo-LT4

Redline makes some good products.
I have no experience using any of with my C4 though.

But I am using Red Line V-Twin transmission oil in my Harley.

GREGGPENN

You'll find similar pricing. Redline MTL is great stuff too. Some even use their lightweight shockproof. Cheapest I've seen used is Pennzoil Synchromesh.

I like the Amsoil stuff myself...and am on the 3rd fill with the stuff. GM stuff used to be good too -- before they discontinued it. Don't care for the Castrol -- as it's a bit too thick for me.


FWIW, I actually found a local guy with 3 qts of Amsoil in stock. He said he'd had it about a year, but it was still sealed. I went for it...didn't charge shipping like prior sellers. That helped a bit.

Phat98

I use Redline Lightweight (aka Smurf Blood) in my ZF6, made a big difference over what was in there before (think it was Pennzoil Syncromesh, it was green). I've never used Amsoil so I can't declare it's better, worse, etc...BUT, $17 is high. I bought my last batch from Jegs, think it was like $12/quart, free shipping also.

I also use it in the Missus' and my Harley transmissions, no clunks and shifts like butter.

Elrick

I'm glad you posted here. What I found in mine was green as well so maybe it's the pennzoil. at least that means it's not the original although maybe not so great that it's pennzoil. since I have to buy 3 quarts and it only takes 2.3, I think, maybe I'll use the extra to flush it out a bit until theres no more green. Thanks for all the replies. I'll report back if there is any big difference

PLRX

Contact Kubs, he is a C4 owner and AMSOIL dist.

GREGGPENN

It's $16/qt -- not $12. with $5 handling. Whether you pick MTL, LW shockproof, or AMSOIL, the total is going to be in the $45 range for 3 qts.

Pennzoil is the only cheap stuff and I wouldn't run it. Based on feedback from the forum, I'd run any of the other three.

Phat98

Checked my receipt, last time I ordered (back in April 2012) it was $65 for 5 quarts ($13/bottle)...no shipping/handling charges. I guess they went up and I didn't notice it...looks like they're higher now. The poor Harleys may just have to go back to Mobil1 synthetic gear oil....

ZD1

went to BMW dealer and bought the ZFDoc recommended 20/50wt castro oil...probably the best shifting cleanest fill i've had and the least amount of brass in the drain.

tried stright synthetic transmission fuild...OK, but seem to break down i bit quicker and performance changed when hot.

Tried Amsoil -Tranny and I didnt like it

Tried Royal Purple - Seems as if it is too slippery ...the engagment is sloppy, but it handles heat okay.

Next fill will be Royal purple 20/50W, though as I am partial to that brand now.

Kubs

Thanks Pete! If anyone has any questions feel free to contact myself or Subdriver.

I use AMSOIL in all of my vehicles and not only does it help improve the performance and longevity, but when used in the engine, transmission, and diff I have seen an average of 2-3 MPG improvement.

GREGGPENN

I use the stuff in my ZF6 and really like it's performance. It's as good as OEM fill....maybe a hair better. But I have SERIOUS doubts about this 2-3MPG claim. (Lets just say I want to throw up the BS flag.)

Give me a double-my-money-back guarantee and I'll try your MPG test.

Phat98

Here, I'll throw the flag for you...:

I don't use Amsoil, but I do use other modern synthetics in all 3 Corvettes (and a Caddy SRX, Northstar V8)...and I support Kubs' claim about the mileage increases, I've experienced it...this was declared in another thread.

If/when you do the fluid changeover don't expect it to happen overnight, or even in a week...it takes a reasonable amount of time to be noticeable. I noticed a small difference in my '94 and a very noticeable difference in my LT4, equitable to Kubs' claim of 2-3 MPG.

Kubs

Just a transmission change won't do it. That 2-3 MPG improvement is with AMSOIL in everything in the drivetrain. Engine, transmission, and differential. I saw an increase of 2.2 on my '90 when it was street driven and almost 4 in my wife's '01 Grand Am GT. Results will vary from car to car, but I have seen improvements in all my vehicles.

GREGGPENN

Hmmmm..... Crappy, long-overdue fluid before? Change from heavier to lighter-weight fluids? Maybe.

Reasonable amount of time to notice? Why? AFR isn't changing. Either reduction of drag is immediate...or it's from wearing/loosening of parts after 50-100k miles?

GREGGPENN

Hence my challenge. (I understood I needed to include the rear/engine oil.)

FWIW, I just swapped to Valvoline 75w-140 in the diff this weekend. So, the challenge just got [presumably] tougher. Plus, I could tell a marked difference between 20w-50 and 5w-30 in the engine. The later revs more quickly.

Seems like weights/viscosity would be the issue. And, I'm guessing dirty fluids have a higher viscosity -- due to contaminants. Clean fluids = lower effective viscostity/resistance.