Is there any merit in using a "cheap" engine oil, possibly a 10-40, for flushing purposes? I have read an account by some expert who recommends a transmission oil for cleaning purposes. Has anyone ever heard of this or indeed tried it?
I have a 1.6 8v Astra "G", (59000 miles) with the usual condensation froth under the oil filler cap. I intend removing the rocker cover and cleaning it plus checking the breather pipes. The engine is due an oil change soon. I am not a great believer in flushing oils and think this may be a safer way of "flushing" the engine prior to filling it with the recommended oil. Any comments would be gratefully appreciated.