After checking the block passages with shop air, the only thing left to restrict oil flow was the filter. Sure enough, it was utterly blocked by sludge. Even after draining for ~30 minutes, it was still more than half-full because nothing was moving through the filter paper.
IF THE IMAGE IS TOO SMALL, click it.
.
The Great Synthetic Oil Fraud 
![oilfilter.jpg After checking the block passages with shop air, the only thing left to restrict oil flow was the filter. Sure enough, it was utterly blocked by sludge. Even after draining for ~30 minutes, it was still more than half-full because nothing was moving through the filter paper.
IF THE IMAGE IS TOO SMALL, click it.
[url=https://www.supermotors.net/registry/media/1129211][img]https://www.supermotors.net/getfile/1129211/thumbnail/oilfilterfl1a.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/1161548][img]https://www.supermotors.net/getfile/1161548/thumbnail/02oilfumotofl1a.jpg[/img][/url]
[url=https://thelubepage.com/amsoil-magazine-articles/magazine-articles/articles/synthetic-the-great-fraud]The Great Synthetic Oil Fraud[/url]](https://www.supermotors.net/getfile/1162796/fullsize/oilfilter.jpg)