[Z06] Diff Fluid Change
Race Director
Joined: Feb 1999
Posts: 19,659
Likes: 34
From: Lenoir City Tennessee
Ci 6, 8 & 10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
I don't really know about the intervals but I changed mine at about 40k or so. My diff was nice and quiet before the change but it had not been changed I am sure since the car was new back in 02. Seven years was probably long enough between fluid changes.
Team Owner
Joined: Dec 2008
Posts: 35,874
Likes: 1,600
From: Honolulu HI
I just changed my trans and diff fluid. I had 21K on the factory fill, and the fluids looked NASTY. I used RP Syncromax in the trans, and RP Max Gear 75w-90 along with the GM limited slip additive upon the recommendations of RPM transmissions. It's not a daily driver, so I will most likely do this every 10K miles.
Melting Slicks
Joined: Oct 2001
Posts: 2,786
Likes: 22
From: Cary NC
I'm running RP Synchromax in the trans and RP MaxGear in the diff (with no GM additive). If your car is a street car. You can run the diff fluid for 50K miles. The tranny service is listed in your owners manual. I forget the amount.
I go well over 10K on the diff and track the car. The trans I do after about 4 track weekends. That tends to take a beating from heat more than anything. For normal street use I would go 25K without hesitation.
The notion of "cheap insurance" doing oil at 3K and trans/diff at 10K is a big waste of money. I wish I lived next door to you guys who waste good fluids. I'd take all your barely worn fluids and put them in all my other cars.
I go well over 10K on the diff and track the car. The trans I do after about 4 track weekends. That tends to take a beating from heat more than anything. For normal street use I would go 25K without hesitation.
The notion of "cheap insurance" doing oil at 3K and trans/diff at 10K is a big waste of money. I wish I lived next door to you guys who waste good fluids. I'd take all your barely worn fluids and put them in all my other cars.
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Team Owner
Joined: Dec 2008
Posts: 35,874
Likes: 1,600
From: Honolulu HI
I'm running RP Synchromax in the trans and RP MaxGear in the diff (with no GM additive). If your car is a street car. You can run the diff fluid for 50K miles. The tranny service is listed in your owners manual. I forget the amount.
I go well over 10K on the diff and track the car. The trans I do after about 4 track weekends. That tends to take a beating from heat more than anything. For normal street use I would go 25K without hesitation.
The notion of "cheap insurance" doing oil at 3K and trans/diff at 10K is a big waste of money. I wish I lived next door to you guys who waste good fluids. I'd take all your barely worn fluids and put them in all my other cars.
I go well over 10K on the diff and track the car. The trans I do after about 4 track weekends. That tends to take a beating from heat more than anything. For normal street use I would go 25K without hesitation.
The notion of "cheap insurance" doing oil at 3K and trans/diff at 10K is a big waste of money. I wish I lived next door to you guys who waste good fluids. I'd take all your barely worn fluids and put them in all my other cars.
Melting Slicks
Joined: Oct 2001
Posts: 2,786
Likes: 22
From: Cary NC
Normally I would agree with you...but it will take me about 2.5 to 3 years to rack up 10K on the odometer; so replacing the fluids over that duration is "cheap insurance" to me. Even though the miles are low, there's something to be said about the age of the fluid sitting in the car.
Team Owner
Joined: Dec 2008
Posts: 35,874
Likes: 1,600
From: Honolulu HI
Yeah I can see with the garage queen cars that don't get used. You probably have so much moisture build up in every fluid. No doubt draining and flushing it helps. Mine is spending more time in the garage now and less time on the street and I hate that. This car was meant to be driven. It looks sad sitting there...
Love to drive the car, but M-F I drive a company car with free gas.