munch90 wrote:

something of the net as well

Engine oils are subjected to a series of industry standard engine dynamometer tests to measure their wear protection capability, sludge and varnish formation tendencies, and fuel efficiency among several other performance attributes before they are approved for use in customer engines. However, these performance attributes are measured at the end of tests and therefore, do not provide any information on how the properties have changed during the tests. In one of our previous studies it was observed that engine oil samples collected from fleet vehicles after 12,000 mile drain interval showed 10-15% lower friction and more importantly, an order of magnitude lower wear rate than those of fresh oils. It was also observed that the composition of the tribochemical films formed was quite different on the surface tested with the drain oils from those formed with fresh oils. The objective of this investigation is to demonstrate how the friction and wear performance changed with oil drain intervals. A fleet of three vehicles was run in Las Vegas and oil samples were collected at various drain intervals from 3,000 miles to 15,000 miles. As in the previous study, the results showed that the aged engine oils provide lower friction and much improved wear protection capability. These improvements were observed as early as the 3,000 mile drain interval and continued to the 15,000 mile drain interval. The composition of tribochemical films formed on the surface with the 3,000 mile drain interval is similar to that formed with the 12,000 mile drain interval as seen before. These findings could be an enabler for achieving longer drain interval although several other factors must to be considered.

munch90 wrote:

I think the best thing to do with any dpf eqquipped vehicle is to check oil level at least weekly and if you find a rise in level then there is diesel getting in the oil from regen

Supacat wrote:

munch90 wrote:

I think the best thing to do with any dpf eqquipped vehicle is to check oil level at least weekly and if you find a rise in level then there is diesel getting in the oil from regen

I had thought of that but then what if you are burning an equivalent volume of oil over the same period?

munch90 wrote:

any ones 2.2 burn oil ?