Just on the side:

I wanted to know if anyone changes their non-synthetic oil and filter every 7.5k miles. Thats what the car's manual says.

Here in Canada, MB dealer would put in dino 15W40 Quaker State oil into a 95 E300D and have you drive for 7.5k miles. Isn't that littlle too long without an oil change on a dino oil?

I just want some opinions from you guys.

Going back to the orig subject, I think will settle with the following:

The OM 606 was used to mostly QS 15W40 and 10W30, dino oil, after 105 k miles, I will switch to:

*Synthetic 5W-40 European Engine Oil for winter

*SAE 15W-40 Synthetic Heavy Duty Diesel and Marine Motor Oil for summer.

I am thinking drain intervals of 6 - 6.5 k miles.

anyone oppose to my choice? Ohh shoot will i start another oil war?