There's some obscure evidence to suggest that too frequent of oil changes increases wear due to chemical cleaning or "stripping" of anti-wear films by fresh detergents. The theory is that wear increases the first few hundred miles after an oil change as old anti-wear films are neutralized, stripped, and replaced, with wear leveling off to a normal rate afterward. The more frequently the oil is changed, the more often this cycle occurs.
Mind you, this was only from one publication, I believe. I don't know of any further research to validate or refute the theory. I don't have a link to the information on hand though I know it's been posted on here a few times before.
Changing every 7,500 miles / kms won't be too frequent with a common API synthetic oil. No big deal there. Some people are still hooked on the 3,000 miles or 3 months lie.
Regardless, I prefer getting the maximum life out of my oil for multiple reasons. Firstly, I think oil/petroleum is valuable and shouldn't be a wasted resource. Why use 7.5 gallons of oil a year, changing it every 3,000 miles, when I could use just 1.5 gallons changed once a year for about the same or lower price and no change or better results in UOAs. Secondly, the less frequently I have to crawl under the car with my bad back, the better. Thirdly, there's more evidence to suggest using good quality oils, (ie: not restricted API oils) at longer intervals of ~15k miles, results in lower long-term wear rates over the life of an engine. (which is also posted on here somewhere)
I guess I view oil like "If it's not broken, don't fix it." If the oil hasn't used up its service life, why change it?
Mind you, this was only from one publication, I believe. I don't know of any further research to validate or refute the theory. I don't have a link to the information on hand though I know it's been posted on here a few times before.
Changing every 7,500 miles / kms won't be too frequent with a common API synthetic oil. No big deal there. Some people are still hooked on the 3,000 miles or 3 months lie.
Regardless, I prefer getting the maximum life out of my oil for multiple reasons. Firstly, I think oil/petroleum is valuable and shouldn't be a wasted resource. Why use 7.5 gallons of oil a year, changing it every 3,000 miles, when I could use just 1.5 gallons changed once a year for about the same or lower price and no change or better results in UOAs. Secondly, the less frequently I have to crawl under the car with my bad back, the better. Thirdly, there's more evidence to suggest using good quality oils, (ie: not restricted API oils) at longer intervals of ~15k miles, results in lower long-term wear rates over the life of an engine. (which is also posted on here somewhere)
I guess I view oil like "If it's not broken, don't fix it." If the oil hasn't used up its service life, why change it?