Just want to offer a few items to consider when choosing an oil. There is a lot of hype out there concerning synthetics, but there are also some very high quality conventional Group 2 oils available that would work great in your FSDE engine. Shell Rotella, Chevron Supreme and Texaco Havoline would be among those. The reason I offer this is because of the experience I have had with the oil in my MS3. Pennzoil Platinum 5W30 was and still is all the rage so that is what I used for ~25,000 miles. I would have it tested by Blackstone Labs every oil change interval ranging from 3,000 to 5,000 miles. The wear metals, mainly copper, would not come down which is not untypical of that engine for a lot of people. It was suggested that I use conventional Group 2 oil for an interval. I chose Texaco Havoline due to its higher moly content, 150 ppm versus 50 ppm for the Pennzoil. After 3000 miles I pulled a sample and the results were surprising. The wear metals dropped significantly. The next oil change interval gave the same results. Im now on my third oil change interval with conventional oil and will be pulling that sample this weekend. Currently I have Chevron Supreme 10W30 in the MS3. Now understand that the MS3 engine is brutal on oil for a number of reasons much more so than the normally aspirated FSDE engine in the Protg. So do not be afraid of using conventional quality Group 2 oil in your engine with 5,000 mile change intervals. Im using Chevron Supreme 10W30 in my Protg5 right now and it has a day of track time on it.
