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#1
11-23-2011, 08:55 PM
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How often do you guys change your transmission fluid?
Back in the day when you could get a filter and a couple gallons of Dexron III for about $25, I used to change mine every 30K. It was always beautiful red in there, and I always got 225K out of my car and sold it without ever having a problem.
I just dropped $65 on 8 qts of Dexron VI and a filter for my '08, as it requires the VI. I changed it once at 75K, and today at 150K. The stuff I drained out was more brown than red. The factory says 100K intervals for fluid changes, but I'm not even happy doing 75K. I might drop back to 50K. What do you guys do?
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Current Grand Prix 2008 GP - 174,000 Former Grand Prix's 1994 GP SE - 231,000 1997 GP GT - 134,000 1998 GP GT - 225,000 2002 GP GT - 222,000 
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#2
11-23-2011, 09:12 PM
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Re: How often do you guys change your transmission fluid?
In the past, 30 k miles was about right for my trans changes. I never worried about doing it too often because one only gets about 1/2 to 2/3 of the fluid out. If the fluid comes out brown, then you are still leaving bad fluid in the trans.
Yes, one can pull off a cooler line and bleed off some more bad fluid but you won't get it all. So, best to change it a wee bit more often than needed, IMHO.
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#4
11-24-2011, 08:07 PM
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Re: How often do you guys change your transmission fluid?
I usually go about 30k regardless on every car I have owned. My comp g has a firm shift kit and line pressure increased so I change it once a year to be safe. probably a little overkill but $60-70 a year or every two years is worth it in my opinion.
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2004 GRAND PRIX GTP COMP G. VIN 4 : OVERKILL CUSTOM PCM, WIZAIR CAI, ZZP TRAILING ARMS, W BODY STORE LATERAL ARMS, ALL POLY/SOLID MOUNTS, STB F&R, ZZP RACE TRANS, ALT REWIRE & VOLTAGE BSTR, 180 STAT, NGK TR6, MPS with 3.4 PULLEY, PACESETTER HEADERS, 1.8 ROLLER ROCKERS, FP REWIRE,ZZP COILS/WIRES, TB SPACER, D&S ROTORS, INTERCEPTOR SCAN GAUGE, CUSTOM STAINLESS 2.5 INCH CAT BACK EXHAUST. 2004 Honda Odyssey EX-L 
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#5
11-25-2011, 08:24 PM
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Re: How often do you guys change your transmission fluid?
Only once in 391,000 miles and it still runs good, uses a little or leaks it out, but still smooth.
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97 Grand Prix GT 360,000 miles as of 02-01-09 391 000 miles as of 11-17-11 400,000 miles as of 3-15-13 01 Duramax/Allison 07 G6 convertible
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