Nice find wce, how did you get it into the ute? I had a decent accident with a big generator on the curbside the other month loading it
Ironbark, running a modern (or really any) small engine on Non detergent oil is a bad idea
While it was recommended in the 50's, we have come a long way in oil technology since.
Aside air compressor oil, I can't think of any readily available Non-detergent oil on the market, except maybe some products made for historic cars.
Detergent oil contains a multitude of anti wear additives, acid control agents and other things that make for long oil and machine life.
The dirtier running the engine, the more detergency required. Hence diesels oil is chock full of it - they have blowby causing acid buildup, soot buildup, etc.
While it is said detergent oils will not 'scrub' away the grime as well as a bottle of engine flush, it does a very good job.
Back when non detergent oils were recommended, the manual said do a flush after dropping the old oil, run 15 minutes, and drain then refill with ND oil. Probably was just kero oil mix back then.
What I do agree on is many rapid oil changes. My personal record is about 5 in an hour on an old 3.5hp briggs. The original oil came out like tar and despite a long drain, only 400ml came out (despite full on dipstick - hence 150ml of sludge in there. Changed the oil every 15 minutes until it wasn't disgusting and then ran longer intervals.
So long as I can get motor oil for between 95c and $2 per L, several flushes are cheap insurance
