5.1 ideally as it's higher temp. But DOT4 is cheaper. I'd rather do more frequent fluid changes with the cheap stuff. (every other year)
If you are tracking it then go for 5.1
DOT 4 230 °C (446 °F) 155 °C (311 °F) 1800 mm2/s glycol ether/borate ester
DOT 5.1 260 °C (500 °F) 180 °C (356 °F) 900 mm2/s glycol ether/borate ester
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2001 Volvo S60 T5 SE 2.3 Geartronic (Scrapped)
2007 Volvo S60 T5 SE 2.4 Geartronic (Sold)
2008 Volvo V70 D5 SE Sport Geartronic (Current)
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