Im a delivery driver.I have about 35k miles on the car now and I drive about 100 miles 5 days a week. All weather driving-NJ. But its starting to warm up now. Its about 1/2 highway driving @ 80 mph and 1/2 city/suburbs lower speed driving mix. I also idle maybe 20 times a day for no more than 5-10 at a time minutes usually. I was thinking about using maybe mazda oil w/moly? However i was planning on using gold plug magentic drain plug and Im not sure if that would pull the metallic additive out of the oil. Any advice is appreciated!