Yes, mineral oil is still available.
Should be mentioned explicite on the container.
You may use a cheap mineral oil speced 10W40 or 15W40 during the running-in period. It flows easier and wear may be a little higher, as intended for running in.
After 1.000 km / 600 miles it should be swapped incl. oil filter.
If you “just” got barrels bored and new pistons and rings, 20W50 would be fine as well for running-in.
If you have got new bearing shells at crankshaft and/or connecting rods,
1.000km with cheaper 10/15W40 may be a good idea.
Then swap it to 20W50.
A word about pricing:
15W-40 is available at any supermarket or discounter. Offer is around 20,- Euros for 5 liters.
20W-50 is only available in “biker stores” and cheapest one we can get is approx 25,- Euros for 4 liters.
In the end not such a huge difference.
Both are far below pricing of full synthetic motor oil.
Cheers, Michael
