Originally Posted By: BarkerMan
Why would you run 30w oil at 5F? No one said VII's were a big problem, just that that they are not engine oil and engine oil is what lubricates the engine. And I think it's understood that you have to change the viscosity with the weather and if you live in cold conditions then you have a reason for running mutli-viscosity engine oil and pay attention to the intervals you use. Or, better yet run a synthetic oil that does not need VII's to be rated as multi-viscosity, maybe somthing like German Castrol 0w-30. VII's prop up a cheaper oil, that's all.
Amsoil has been an advocate of extended oil change intervals because they make very good oils that require few if any VII's and can stand long intervals. Mobil 1 did not ever push extended intervals until they came out with their EP product. And that oil may not be suitable for warranty purposes in new cars. Why the difference between EP and regular Mobil 1. Could it be that the chemistry of regular Mobil 1 is not up to the task. Could it be that they have added VII's to the mix get depleted enough for Mobil to recommend longer intervals?
Picking a superior engine oil what ever the viscosity could be reduced to one that need no VII's as a first requirement.
Not true about Mobil One never pushing extended OCI's before the advent of their EP formula. When Mobil One came out back in the mid 1970's, it was said to be good for 1 year or 25,000 mile OCI's. After awhile, they had complaints from people who tried this OCI and failed to regularly check their oil levels, and ruined their engines when they ran out of oil, and dropped this claim.
I began using Mobil One back then, and it was only initially available in 5W20 weight, and was said to be the equivalent of regular 10W40 oil. I used it until 2001, when I retired. I usually put 18,000 to 20,000 miles a year on my daily driver back then, and I made it a practice to change my oil every January. I added several quarts of oil per year as make-up oil, and never had an oil related problem.
In 2001, I retired and began driving only about 6000 miles a year. I then began using dino, changed every 6 months. I couldn't see wasting good synthetic on a 6000 mile OCI. I used up my remaining stock of M1 in my lawn mowers and other outdoor power equipment. By the way, I recently used up the last of my old stock M1, and have changed my OPE over to Mobil One High Mileage formula, which is still available in SL.
