At about 190,000 miles I switched from Mobil dino and 3,000 mile intervals to Mobil 1 and 5,000 mile intervals.
At about 4,000 miles I need to add some oil (less than a quart). I do have a minor leak that I don't atribute to switching over and it still goes over 3,000 miles before any loss is noticable on the dipstick.
After three oil changes with Mobil 1, I tried Valvoline Max Life full synthetic to see if indeed it made any difference in the slight oil consumption. It did not. I bought up a bunch of the full synthetic Max Life on sale. Once it is gone I may switch back to Mobil 1. I doubt that I will go all the way back to Mobil dino and 3,000 mile changes, but it is possible.
I want to stress that what oil loss I have may be from leaks and even if it is burning some it still shows no loss until well past 3,000 miles.
You should have no reason to fear switching to synthetic.
Edit: And I should mention that I have always used 5/30. Quit using 20/50. It is not good for that engine.
Last edited by Big Jim; 02/16/05 11:57 PM.
