with almost any 60x engine I backfill the engine from the upper radiator hose first - it takes about a gallon, then I fill from the expansion tank.
When you fill from the expansion tank only you will have to deal with filling the engine slowly by just a trickle going in from the top radiator hose. This can lead to overheating very quickly.
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2012 BMW X5 (Beef + Granite suspension model)
1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)
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