What really matters to me is that it's changed at a reasonable interval.
What really matters to me is that it's changed at a reasonable interval.
What really matters to me is that it's changed at a reasonable interval.
What's considered reasonable? Wouldn't this depend on a lot of factors?
I would change that to "Maintains minimum HTHS required by engine design". Manufacturers are likely well aware that most GF-5/GF-6 5W-30 is simply 5W-20 with a lot of extra VII.
Not necessarily most of the Eurocar 0w40 oils seem to be loaded with GTL and PAO that have naturally high VI and have high shear stability, where as something like Delo 400 5w40 or Rotella T6 are probably hydrocracked crude loaded with VIIs and are known to shear.0W40 or 5W40 oils have lots of vii I assume.
should we call 5W40 a simply 5W20 with "a lot of extra VII"?
Which engine do you recommend to run this test with?
What matters to most in the real world is that they dont have to lift the hood. The oil change light tells them its time..
So many %- dealer oil changes only.
So many %- whatever the oil change place puts in.
So many % - whatever the oil filler cap says.
Then there are the guys on this forum. Some use 15w40 in a Prius, some use 0w20 for towing.
I wish the SAE would test motor oil at 3,000 and 5,000 miles and see which oil still meets their standards.Now that would be interesting.
0W40 or 5W40 oils have lots of vii I assume.
should we call 5W40 a simply 5W20 with "a lot of extra VII"?
A 0W-40 is usually uses bases similar to an A3 0W-30 and a 5W-40 bases similar to an A3 5W-30 so yes I would. Why do you think we often see 0W-40 drop into the 30 Grade range on short drain intervals? This also why many Euro manufacturers treat these grades as interchangeable as long as A3.
An HDEO 5W-40 may be an entirely different thing but I assume we are talking PCMO.
A 0W-40 is usually uses bases similar to an A3 0W-30 and a 5W-40 bases similar to an A3 5W-30 so yes I would. Why do you think we often see 0W-40 drop into the 30 Grade range on short drain intervals? This also why many Euro manufacturers treat these grades as interchangeable as long as A3.
An HDEO 5W-40 may be an entirely different thing but I assume we are talking PCMO.
This is exactly why I said "reasonable", and not something specific.What's considered reasonable? Wouldn't this depend on a lot of factors?