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- Newsgroups: rec.autos.tech
- Path: sparky!uunet!sun-barr!cs.utexas.edu!convex!news.utdallas.edu!corpgate!crchh327!crchh435!ericy
- From: (Eric Youngblood)
- Subject: Re: Manual vs. Auto lifetime
- Message-ID: <1992Jul31.192944.28935@bnr.ca>
- Sender: news@bnr.ca (News on crchh327)
- Nntp-Posting-Host: crchh435
- Reply-To: Peon w/o Email priv (Eric Youngblood)
- Organization: Bell-Northern Research, Richardson, Tx
- References: <31JUL199211275769@erin.caltech.edu>
- Date: Fri, 31 Jul 1992 19:29:44 GMT
- Lines: 46
-
- In article <31JUL199211275769@erin.caltech.edu>, shoppa@erin.caltech.edu (TIM SHOPPA) writes:
- |> Hello,
- |> When I was looking for a car, many people told me to get a manual
- |> because they are much more fun to drive, give better acceleration, and better
- |> mileage. A few people told me that an automatic would last much longer, from
- |> their experience. I ended up with an automagic because I didn't want the
- |> hassle of using a manual in stop-and-go driving but was wondering what the
- |> people on the net thought of the lifetime of these transmissions? I have
- |> seen many automatics happily working at 150,000 miles with zero
- |> maintenance while it seems to me that at this point on a manual there would
- |> have been several clutch replacements at the very least, and the gears
- |> sometimes are starting to show wear. Any comments or experience?
- |>
- |> Tim (Shoppa@erin.caltech.edu)
-
-
- I think the key to long lived automatics is periodic fluid and filter changes.
- I have read every 2 years & up to 50k miles but I think that's pushing it.
- I drain the pan once a year (gets about 3-1/2 quarts) and do a full change
- (10 qts includes torque converter) and filter every 25k miles.
-
- The other thing that kills an automatic is heat. Stop and go driving in traffic
- during the summer w/ AC on can really cause fluid temps to soar. I think ATF
- performs best between 185-225 deg??? When you get above this the fluid begins
- to oxidize (read turn brown). An auxillary cooler is cheap insurance, if connected
- in series with the existing radiator-tank heat exchanger you will not have to
- worry about cold weather operation or insufficient cooling.
-
- I've got a TH350 used in a high performance application (read driven hard & quick
- accelerations) 100+ degrees is not uncommon down here and I have also towed boats
- and trailers on occassion. (*note* pan gets drained after each tow abuse)
- I've got 181,000 miles on it now and going strong. The fluid is the power transfer
- medium, lubrication, & cooling medium. Its performing *alot* of functions, if you
- can maintain it you'll be going a long way to getting the most out of your
- automatic.
-
- *note* later and firmer shifts reduce slippage wear and heat buildup. Most new
- automatics can be selected to shift later & harder in the "power" mode. This of
- course may lower your gas mileage slightly, but reduces transmission wear.
-
- I've never owned a standard so I cant say what periodic maintenance can be performed to increase longevity or whether any can be performed by the home
- mechanic. I'll leave that question open to the net.
-
-
- $0.02
- Ericy
-