'My point isn't the absolute number of miles, that will likely vary by
vehicle and by severe vs. normal service. My point is that the
manufacturer's recommendation for the type of driving you do is
typically fairly conservative. There is simply no need to perform
maintenance more frequently than required.'
REPLY: My point is that you canNOT trust the Manufacturer's advertised
maintenance claims ; which is why I change my fluids more often myself
using all synthetics...except for the Trans Flush/Drain which i have a
local shop perform. Ive seen the condition of fluids after the
Manufacturers suggested maintenance schedule...and its rediculous
pushing it to that extreme.
'Its 'not wasting money' when the manufacturer is pushing it to
the limit on maintenance durations to make the vehicle (and them) look
good.
And how do you know this? Are you a transmission designer?'
REPLY: I am an avid reader of Technical Articles written by Authoritys
in various mechanical fields in addition to having worked in a related
Mechanical Trade for over 30 years at a maintenance/teardown/rebuild
level. Car Manufacturers, like Car Dealers, cannot be 100% trusted to
give the correct story when it comes to maintenance...in addition to
design in many cases.
'Common sense is very often wrong. '
REPLY: Common sense which comes from a mechanically oriented person ,
is usually right. Especially if that person has had first hand
experience from a design, application, and repair standpoint.
'Transmission fluid isn't like engine oil. It doesn't see contaminants
from combustion that form the nasty acids and such that make the life of
engine oil fairly short. Unless you are towing or really abusing your
automatic, the only thing the oil has to deal with is wear material from
the transmission itself. With a good filter, this isn't a problem for
many, many miles. I've never seen a transmission filter even close to
being clogged even after 50,000 miles. The other issue for the fluid is
heat, but again is is rarely a problem unless you are towing. And then
the manufacturer's change intervals are typically a lot shorter. '
REPLY: Automotive Transmission Oil OFTEN SEES contaminants in the form
of metal particulates, acidity, and condensation . And heat IS OFTEN a
problem in modern auto Transmissions especially in hot climates and/or
mostly city driving where the clutches are constantly shifting ; heavy
cargo loads or people loads contribute to the issue. Go to
www.amsoil.com for further education on this subject.
'So, realistically compare your driving environment to the description
in the maintenance section of your owner's manual, select the
appropriate maintenance schedule, follow it, and you'll be fine. No need
to do things twice as frequently, unless you like wasting money and
time.'
REPLY: And keep in mind that 100,000 mile suggested changing of fluids,
spark plugs, and coolant...come from Manufacturers who very often have
an ulterior motive .
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"The only thing necessary for evil to continue, is for good (tolerant)
men to do nothing" -- C.S. Lewis.
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