I'm considering buying this 02 V70 2.4T which is in immaculate shape with 161km from original owner with all service records. The only concern I have, is that the owner followed service manual oil changes every 12,000km using conventional oil. When I removed oil filler cap I saw burnt oil/sludge on inside of oil cap and inside of filler neck. I contribute this to extended oil change intervals using conventional oil. As 12,000km on convetional oil, especialy on turbo engine, is way too long. But that's Volvo service for you. As I have a 740T with 448km running on synthethick Modil 1 and there in no sign of burned oil or sludge. Engine still runs and sound like a clock and original clutch.

My question is, would I be able to remove some of this burned oil sludge with a few flushes. I would then fill it with Mobil 1. Or is there concern that any loose sludge may do some internal damage. I took the car for a test drive and mechanically it sounds good ,and engine pulls when you step on it.

I thank you for any advice.