Hello all, just changed oil, drained old, flushed, renew with 10w40 ran engine for a few minutes, than drained oil, fit new filter and fill with 10w40 again. Engine seems to be quieter as only had vehicle since march and don't know when it was last done. New oil seems to be quite thin and is black as the ace of spades, I know this will never be clear but I have seen oil SHPD E7 15W/40 ENGINE OIL. Would this be a good one to use as the engine has done 171k or am I being a bit over the top.