What Fluids Do You Use? Oil, Clutch, Trans, Diff...
Thread Starter
Burning Brakes
Joined: Apr 2005
Posts: 877
Likes: 0
From: Appleton Wisconsin
What Fluids Do You Use? Oil, Clutch, Trans, Diff...
I am looking into replacing all of the fluids on my 03Z. Why? Because some need to be replaced and I am the 4th owner at 23,000miles so I would like to have everything done for the peace of mind.
Which fluids do you use for...
- Oil/Filter
- Clutch/Brake Fluid
- Transmission Fluid
- Differential Fluid
- Coolant
BONUS
- Favorite alcoholic beverage
Which fluids do you use for...
- Oil/Filter
- Clutch/Brake Fluid
- Transmission Fluid
- Differential Fluid
- Coolant
BONUS
- Favorite alcoholic beverage
Acct Suspended APR 2026 by request
Joined: Dec 2010
Posts: 10,367
Likes: 1,272
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
oil/filter - mobil 1/wix
brake/clutch - haven't changed it yet
trans- amsoil torque drive atf
diff - amsoil severe gear
coolant - gm dexcool
bonus - i don't drink lol
brake/clutch - haven't changed it yet
trans- amsoil torque drive atf
diff - amsoil severe gear
coolant - gm dexcool
bonus - i don't drink lol
Drifting
Joined: Oct 2011
Posts: 1,872
Likes: 333
From: Olmsted Falls Ohio
St. Jude Donor '12 thru '24
Oil: Mobil 1, with a PF46 filter
Clutch and brakes both use Delco Supreme 11 brake fluid, # 12377967
Transmission: Royal Purple Max ATF (6-sp manual)
Diff: Dexron LS Gear Oil 75w-90, # 88862624, has the friction modifier already in it
Coolant: AC Delco DexCool
Recently did all my fluids so it's set for a while - it's a seasonal car so not too many miles every year. Will change oil / filter once per year and the others as per the service manual recommendation. Fluids are cheap maintenance.
Beverages? Alcoholic beverages? Don't need no stinkin' alcoholic beverages!
Clutch and brakes both use Delco Supreme 11 brake fluid, # 12377967
Transmission: Royal Purple Max ATF (6-sp manual)
Diff: Dexron LS Gear Oil 75w-90, # 88862624, has the friction modifier already in it
Coolant: AC Delco DexCool
Recently did all my fluids so it's set for a while - it's a seasonal car so not too many miles every year. Will change oil / filter once per year and the others as per the service manual recommendation. Fluids are cheap maintenance.
Beverages? Alcoholic beverages? Don't need no stinkin' alcoholic beverages!
Le Mans Master
Joined: May 2005
Posts: 6,366
Likes: 249
From: Fort Lauderdale, Florida
Filter - NAPA Gold (same as WIX)
Oil - Pennzoil Ultra or Royal Purple
Clutch - Prestone DOT 4
Brakes - Castrol GT LMA
Trans - RP Synchromax
Diff - RP Maxgear
Coolant- Prestone Dex-Cool
Beverage- Chateauneuf du Pape or Coke Zero
Oil - Pennzoil Ultra or Royal Purple
Clutch - Prestone DOT 4
Brakes - Castrol GT LMA
Trans - RP Synchromax
Diff - RP Maxgear
Coolant- Prestone Dex-Cool
Beverage- Chateauneuf du Pape or Coke Zero
Burning Brakes
Joined: Feb 2008
Posts: 949
Likes: 1
From: Tampa fl
St. Jude Donor '14
I recently put royal purple in oil, diff, addative with prestone for radiator, trans. Noticable difference. I use dot 4 in brake and clutch. pepboys has a printable coupon for 12qts of poyal purple right now for $70 so....
Pro
Joined: Jun 2010
Posts: 543
Likes: 9
From: Northborough MA
you know you are going to get 1000 different opinions on what to use? From what i read in the autox forums. Mobil 1 0w-40, Napa gold filter, Castrol whatever ATF, Amsoil Severe Gear, Super blue brake fluid.
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Premium Supporting Vendor
Joined: Aug 2001
Posts: 5,364
Likes: 38
From: King George VA
- Oil/Filter
I use a racing oil, but used this top tier of AMSOIL oil in my CTS-V (LS2 engine) while it was my daily driver:
AMSOIL Signature Series 100% Synthetic 5w30 (Product Code ASLQT)
I run a Wix 51042 in my Z06 at the track and think that is a good option unless you use long oil change intervals.
- Clutch/Brake Fluid
AMSOIL Series 600 DOT 4 Racing Brake Fluid (Product Code BF4SN)
Dry Boiling Point - 580F, Wet Boiling Point - 410F
- Transmission Fluid
AMSOIL Torque-Drive Synthetic Transmission Fluid (Product Code ATD1G)
- Differential Fluid
AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 (Product Code SVGQT)
- Coolant
I use a 75% distilled water, 25% dexcool ratio at the track with one bottle of AMSOIL Dominator Coolant Boost (Product Code RDCBCN)
I also use:
AMSOIL P.I. Performance Improver (Product Code APICN)
AMSOIL Synthetic Power Steering Fluid (Product Code PSFCN)
I can get any of the above for forum members at my dealer wholesale price, about 25% below retail, via the AMSOIL Preferred Customer Program. Drop me a PM if interested.
P.S. BV Chardonnay (grew up just south of Napa)
I use a racing oil, but used this top tier of AMSOIL oil in my CTS-V (LS2 engine) while it was my daily driver:
AMSOIL Signature Series 100% Synthetic 5w30 (Product Code ASLQT)
I run a Wix 51042 in my Z06 at the track and think that is a good option unless you use long oil change intervals.
- Clutch/Brake Fluid
AMSOIL Series 600 DOT 4 Racing Brake Fluid (Product Code BF4SN)
Dry Boiling Point - 580F, Wet Boiling Point - 410F
- Transmission Fluid
AMSOIL Torque-Drive Synthetic Transmission Fluid (Product Code ATD1G)
- Differential Fluid
AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 (Product Code SVGQT)
- Coolant
I use a 75% distilled water, 25% dexcool ratio at the track with one bottle of AMSOIL Dominator Coolant Boost (Product Code RDCBCN)
I also use:
AMSOIL P.I. Performance Improver (Product Code APICN)
AMSOIL Synthetic Power Steering Fluid (Product Code PSFCN)
I can get any of the above for forum members at my dealer wholesale price, about 25% below retail, via the AMSOIL Preferred Customer Program. Drop me a PM if interested.
P.S. BV Chardonnay (grew up just south of Napa)
__________________
C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
C66 Racing #66 NASA ST2, SCCA T2
AMSOIL Dealer (Forum Vendor)
AMSOIL Preferred Customer Program (Members buy at Wholesale - a savings of about 25%)
Cruising
Joined: Oct 2011
Posts: 14
Likes: 0
Oil- mobil 1 or amsoil ( best deal at time) 5w-30
Clutch- ( I have an auto)
Tranny- Schaffer ( aftermarket tranny) or SYNTHETIC alternative
Diff- mobil1 ( cant remember weight) plus 4 oz. mobil limited diff addivtive.
Coolant- Dex-cool with watter wetter ( Lucas Oil) change every 2 years
Beverage- Yuengling Lager Draft, or Skyy and tonic lemon and lime
Clutch- ( I have an auto)
Tranny- Schaffer ( aftermarket tranny) or SYNTHETIC alternative
Diff- mobil1 ( cant remember weight) plus 4 oz. mobil limited diff addivtive.
Coolant- Dex-cool with watter wetter ( Lucas Oil) change every 2 years
Beverage- Yuengling Lager Draft, or Skyy and tonic lemon and lime
Intermediate
Joined: Oct 2011
Posts: 25
Likes: 0
Previous owner of my 99 C5 used Mobil 1 15W-50. Needs an oil change now and am wondering if I should stay with the same weight. MOst of what I'm reading says lighter weight if not racing the car.
It's a daily driver that lives in Vegas.
It's a daily driver that lives in Vegas.
Le Mans Master
Joined: Jun 2008
Posts: 5,284
Likes: 235
From: Rockledge FL
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
- Oil/Filter - M1 15-w50 / GM
- Clutch/Brake Fluid Castrol SRF
- Transmission Fluid M1 ATF
- Differential Fluid M1 Gear Oil
- Coolant Water and 2 bottles or Water Wetter
BONUS
- Favorite alcoholic beverage Bourbon or Single Malt Scotch
- Clutch/Brake Fluid Castrol SRF
- Transmission Fluid M1 ATF
- Differential Fluid M1 Gear Oil
- Coolant Water and 2 bottles or Water Wetter
BONUS
- Favorite alcoholic beverage Bourbon or Single Malt Scotch
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
Melting Slicks
Joined: Jan 2004
Posts: 3,012
Likes: 15
From: Jensen Beach FL
Can you also use Prestone Dot 4 for the brake fluid? I currently use Prestone Dot 4 for the clutch and would like to keep it simple and use Dot 4 for both.
