Hi.
"he assures me he flushed it filled up ran it for a week then changed again"
If he flushed it then there was no need to change it again a week later , so that`s bull. A flush through is until it`s clean so wouldn`t need changing.
All he`s done is a sump dump or two, possibly.
All you can do now is to check the level when everything`s nice and hot / engine running. The oil will be still be pretty clean if it was flushed but you can`t tell by looking at what`s on the dipstick - you`d have to drain it.
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