So what is up with M1 having all these different formulations, high mileage, low mileage, new mileage etc. etc. I have been running M1 10W-30 in my Ranger at OCI's of 10k. It burns about 1/2 a quart in the first k or two then stops. I would call this boil off of volatiles. The truck has 200k on it now and still burns less than a quart between changes. I use the same 10k OCI on my wife’s Subaru Legacy and it does not burn much either. So am I being evil by not using the high mileage M1? I just put the same oil in my new to me 2000 V10 Excursion. I was planning on running a 10k OCI on it as well unless I am towing alot. It had 5W20 in it (yuck). Why make a synthetic that you can’t run at least 10k miles on? What is the point in running a synthetic otherwise? If not M1 what would be a better alternative? I may do an oil analysis on the Range soon just to see how it is doing at 200k. I have a 91 Turbo Eclipse and have been running M1 15W-50 in it since it was new. I have been thinking of going to 10W-30 on it as well and maybe it would quiet down the lifters a little. A Dodge Caravan I had did not like 15W-50 it made the lifters chatter.
Perry
Perry