I was four wheeling with a friend here in Boulder, Colorado in his 80's 4WD Toyota Pickup with the 22R motor and nearly 300,000 miles on the truck. When we stopped I noticed at bottle of Car and Driver SAE 5W30 Oil which he uses. Being the oil nut I asked him how often he changes the oil. He says, "never". Actually, not since around 200,000 miles. He says it's had a constant oil leak, so he just adds a quart "every so often", so there's no need for oil changes! Anyone heard of Car and Driver motor oil? I have no idea where he gets it, probably the hardware store!