having oil engines of 4600 i.h.p., was n to 12 tons of oil per day, or less than one-sixth of the weight of fuel which a coal ship would have needed. In view of such figures as these, it is small ...

You might recall I pulled the cylinder head of the Jeep some two months ago to inspect the piston. In the end, I decided to ...

In short, the older flat engines in particular can't just use any old oil. The development of an engine oil for classic air-cooled flat engines has therefore been something akin to a balancing act ...