The Independent Volvo garage I bring my car to doesn't do transmission flushing, nor do they recommend it (They only do drain & fills). I know plenty of other garages that don't recommend flushing either, nor do they offer it as part of their services. These are professional garages with trained technicians, so I consider their advice to be sound & something I personally take heed of. Whether you do the same is your choice.
Flush your transmission if you want to. Saying a complete flush is the only way to do the 'job properly' isn't correct - Its the only way if you want to replace the fluid all in one go. You can do multiple drain & fills of the transmission over a period of time, if required, based on the condition of the existing fluid & it'll be just as clean as flushing it all at once in the end - That's also another way of doing the 'job properly'. Although, it might take a bit longer to do admittedly because its done in stages, but its less risky too.
Do as you please, call it BS, call it what you want... Its your car & its your decision what you decide to do with it. I'm only offering an opinion & advice I've been given. Whether you take heed is up to you.
Quote:
Originally Posted by dambat
Every time you change the engine oil, you do a complete change, not a partial change.
It's pretty much the same as the "flush" method for a gearbox change. You're progressively changing all the oil, rather than only 1/2 at a time. It's not like you're doing it at high velocity, with a solvent etc. Yes, any change to clean oil has the potential dislodge material, but if it's that bad, it's probably terminal anyway.
Damien
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In case you weren't aware, when you do an oil change, you aren't removing
all the oil from the engine either by draining it from the sump. Removing
all the oil from the engine to do a 'complete change' is next to impossible, unless you plan on removing parts from the engine & tipping them into your oil catch can when you next service your vehicle to drain every single bit of oil out of them
Draining via the sump doesn't remove all the engine oil, there is still a considerable amount deep within the internals of the engine that you can't access. Why do you think the owner's manuals for vehicles say a car holds x amount of oil, yet when you go to service it, you need much less than the figure quoted? Those figures are based on a completely dry engine & the only time that would occur would be at manufacturing. So when you do your oil change, you're
draining the oil out of the engine via the sump &
filling it back up through the oil filler neck... You aren't doing a complete change like you may think. The same principle applies when
draining &
filling the transmission... You aren't removing all the fluid either, the same as an oil change.