[A horse with no name]

[QUOTE=kjhkjhg;8321658]yup - i was a dino oil guy forever. then i actually learned something about oils, and now will never run dino oil in anything, especially something with some miles on it.

Of course to use or not use a synthetic or Dino oil can depend on how many miles per year, including how fast you drive. If it is 'high' & 'fast' then go Synthetic. It has as you know a much higher heat range which is especially good when racing.

I have used full synthetic's and now choose to have two dino oil changes in our family car (5-30) rather than one with synthetic. We only put on 7000K a year average. It's mainly the carbon in the oil that wears it out that's why vehicles on natural gas go forever- No carbon.

If one always keeps their oil looking like new even when changing it- all will be well as there is little to no carbon in it... Diamonds are created from carbon.

Re using synthetic oil in high mileage engines may not be the thing to do. Synthetic's viscosity is very thin when hot and it is know to leak through seals on older engines. Because it's viscosity is so thin you can also end up with a noisier engine on high milers. Being so thin it will slide through very small gaps where as Dino tends not to..

From new, our Carrera ('86' - 75,000K) has never leaked oil from anywhere with either the originally recommended Dino oil nor the Mobil 1 15-50 full synthetic.

The above is only my option which would be only one of hundreds/thousands of opinions when it comes to what oil to use. Only my 2˘ worth .