I've found the same thing with adblue, using the big container from euro carparts, think it's just an airlock issue, first few litres took ages then it seemed to go a bit better. Got a bit of the adblue splashed back a few times, luckily it doesn't seem to be smelly, was worried that it might smell "nasty" with urea being the active ingredient.
What's the SS issue you've seen? My S90 does seem over-eager to stop the engine, and frequently shuts it down before the car is fully stopped.
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Volvo S90 D5 R-Design
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