Hi everyone. I recently had the head of my 250SE crack and had the head re-welded and reconditioned. the only problem is, I had it done by a back yard mechanic who simply drained the old oil, and put new oil in it without without going to the expense of have the entire engine cleaned out. So even with the new oil, I still have water in it. My mechanc says it should simplt evaporate but I highly dbout this.
A friend of mine suggested buying really cheap oil, and doing an oil change every 2 days for 2 weeks.

Is that a fesable course of action without cost too much $$$?