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Moving from Dexron 3 to 3309 oil in my Transmission

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Moving from Dexron 3 to 3309 oil in my Transmission

Post by Namo » Sat Feb 29, 2020 2:29 pm

Hello guys, I have been using the Dexron 3 in my 2002 volvo s60 NA with 140,000 on the clock for about 4 months. I was recently informed that Dexron 3 would cause harm to my Transmission and mobil 3309 or or Toyota T-IV. So now I would like to move to the recommended oil. How do I go about this? Can I just do a drain and fill using the new recommended oil?
2002 volvo s60 2.4 non-turbo, Automatic gearbox.

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Re: Moving from Dexron 3 to 3309 oil in my Transmission

Post by vtl » Sat Feb 29, 2020 5:12 pm

Drain and fill a few times, it takes about 3 liters per round.

Dexron III misses friction modifiers, it causes harsh gear shifts and erratic controlled slip. It could be your ATF it Dex-III compatible, but also has a modifiers pack that makes it compatible with modern transmissions, like AW55. You would notice for sure if ATF has no friction modifiers.
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