Mobil had a really good series of adds down here during the 80s.
Picture a car (VC Commodore ?) belting along a rural road.
"To prove how tough our oil is, we drove from Sydney to Perth...and back...and back...aaaand back..AAAANNNNDDD BACK.
[image of Oz, and a line going backwards and forwards across it 5 times]
Mobil Super Drop, with 20,000 kilometer reserves" (was a dino 20W-50)
Picture the same ad, same(?) car
"To prove how tough our oil is, we drove from Sydney to Perth...and back....and back....and back....and back...and back......and back....and back....aaaand back..AAAANNNNDDD BACK.
[image of Oz, and a line going backwards and forwards across it 10 times]
Mobil One, with 40,000 kilometer protection"
(can't recall if it was the 5W-20, or they had gone to 15W-50 - in think the latter, as I used to make a synth blend with Duckhams 15W-50 around then)
If you catch a Mobil tech on a good day, and you let him know that the car is out of warrarnty will still admit to 40,000km and 1 year (both requirements)