So why should you let Carma change your oil? Today, while performing an Oil Service on a customers '03 325i, I found a good example of why, and one that I come across quite often.
Here I am cleaning the threads for the drain plug in the oil pan. I had to do this because someone (Quik-Lube tech) over-tightened the plug. And the plug?
The drain plug on the left is the old plug. If you look closely enough you can see the top thread on the plug is flattened out. The plug on the right is a new one. What has happened is the Quik-Lube guy tightened this plug too much, squishing the final thread, which then wreaked havoc on the oil pan on the way out. The drain plug is made from steel, which is harder than the aluminum the oil pan is ma
de from.So that's one reason that I personally think it's better to let Carma change your oil. It may cost a bit more, but do you really want someone screwing up your baby?
