Maybe srt like Mahle some German vehicles oem??? One of the layers in the two layer fleece filter is for support, thus no need for mesh we see on every spun microglass.
The cellulose-free filter medium
Today in the series, tomorrow in the workshop
Increased service life makes also higher demands on the filter media in oil filters, particularly as the new engine generations with direct injection increase the problem of oil aging. With the use of new fully synthetic high performance oils, replacement intervals of up to 50,000 km are reached—with a trend to even longer intervals. However, due to the new general conditions, conventional filter raw materials are becoming less suitable, especially as the excessive nitration of the oils leads to embrittlement of the filter medial.
The response from MAHLE: a fully synthetic two-layer fleece made of polyester, consisting of a support and a filtration layer. This makes it possible to achieve highest filtration performance with best stability—and at the same time block forming in the pleats can be avoided. Compared with cellulose fibres, the aging stability of the new oil filter medium is 7 times higher—and it offers the same or even lower pressure drop at significantly increased dirt pick-up capacity. The new cellulose free filter media are, for instance, available for Mercedes-Benz vehicles in the Aftermarket.
Just didnt feel like making another post, so back to the forum favorite...
What does Ea Mean?
Absolute efficiency (Ea) describes filters that pass the muli-pass (beta ratio) test with a contaminant-removal efficiency rate of 98.7 percent
I guess someone from Amsoil can't spell, ea is a mis spelling, it should be AE.
From amsoil on the amsoil ea/royal purple filters, thus why we see the patches so clean, and this is at 15 microns even lower then the average 20 micron ratings we usually see. Also, you see why there is better flow and better filtration, because of the size of the paper fiber compared to the synthetic, usually you get one or the other, but in the case of spun microglass there is no downside.