Bigshankhank
New member
thanks. so a sample of a synthetic blend at 5200 miles tested good, yet there are those who change their full synthetic oil at 3000-4000... this is just another example of proof that oil lasts a LOT longer than most people think.
That's just pouring money down the drain IMO. My dad had a couple of Mercedes C-class cars back in the 90's and the factory maintenance schedule called for full synthetic oil changes every 7500 miles. As a matter of fact I have been so busy lately that I didn't get to my most recent oil change on the 4-runner until a little over 7000 miles and I doubt it made a lick of difference except to irritate me that I am now off my usual easy-to-remember 5000 mile odometer check.
My rule of thumb;
Semi-synthetic in every car.
Full synthetic in my modern bikes
Conventional in my older (pre-1990) bikes.
Rotella in my diesel RV.