Originally Posted By: 1999nick
You know, on the Mobil One website, I count 19 different formulations and weights of Mobil One. So-called regular M1 comes in several different weights, then there is the "fuel economy" version in a couple of weights, the 15,000 mile version, the high mileage version, the truck and suv version, the Diesel version, and the two motorcycle versions.
These many different combinations probably have different percentages of III and IV components, as well as antiwear and detergent additives.
I, personally, used M1 from the time it came out, back in the middle 70's, until I retired a few years ago. At first, it was advertised to be good for 25,000 miles or one year, whichever came first. I understand that a lot of people ruined their engines by trying to run them 25,000 miles without checking the oil level. My cars always used at least 3 quarts in my year's driving, which was usually 18,000 to 20,000 miles. My engines always remained clean and quiet, tho I never was one to keep a car forever; 140,000 miles is the most I ever put on a car before trading or selling.
Evidently they have changed the formula in the last few years in "regular" M1. They have put out the version they now say is good for 15,000 mile or one year intervals. My usual question about this oil, is: what did they do to "regular" M1 to make it good for, apparently, less than 15,000 miles?
I have recently gone back to using M1 in my personal vehicle; I use the high mileage 10W30 version; as I now only drive 6 to 8,000 miles a year, I will change it once a year. I have also changed all of my lawnmowers and other OPE's to this oil, since I am wary of using the SM versions in my small engines, and the M1 10W30 and 10W40 high mileage oils are still SL.
My hunch is probably 7,500 to 10,000 miles. I asked their tech department about how long their 0w30 was good for. The response I got was one year or 10,000 miles.
ther wise,why bother? I know extended drain intervals right?,well i dont buy that either.
