They are specifically recommended for my Daughters' 944 Porsche. I use them and find them to be quite acceptable. I CERTAINLY don't want to wrench on that thing anymore than necessary!!! John__Las Vegas.
This is listed on SWEPCO's website as being one of the benefits with their 305 & 306 motor oils:
Long drain service up to 100,000 miles or 600 hours with LOA Program.