Oil gets just as dirty & contaminated if it,s synthetic or natural oil. Longer change intervals will not get rid of the contamination. Natural products are still best in most cases.
Wood is still a great building product. Wool & cotton are still the best fabrics.
Just my 2 cents worth. I'm kind of old fashioned. Back in the 50,s they came out with a synthetic oil. It turned into a disaster. It didn,t lube the upper rings good. Many low mileage cadilacs had to have ring jobs.
