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Sounds like the heavier oil blew out a weak turbo seal. It was probably already on it's way out, and this just helped things along.
A blown head gasket could also be the culprit. The main oil feed to the head runs up a galley between cylinders #1 and #2 on a B230F.
A broken ring would cause similar problems.
Pull the plugs and see if they are all sooty or if only one is. If they are all oil-fouled a turbo seal would be my guess; otherwise suspect a blown head gasket (if cyl. #1 or #2) or a bad ring in that cylinder.
The other possibility is the mechanic tromped on the gas and spun up the turbo before the new oil filter had a chance to fill up and get oil to all the parts, and smoked a few parts, but you'd really have to piss your mechanic off to do that.
As for the grade of oil, your owner's manual is the only place I'd trust. I've been satisfied with Pennzoil, but I found Castrol causes a varnish buildup. Personally, I've never bothered with synthetic. I've always believed the only way to get rid of dirty oil is by changing it often, not by using more expensive oil. I can't justify the cost of dumping 4.5 liters of synthetic every 5000km.
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