I purchased a 2005 Expedition with 30,000 miles. I switched from regular oil to synthetic about 12,000 miles ago. Every 3,000 miles I have the filter changed and the oil topped off. How long can I do this before I need to do a complete change?
Steve from Amherst, N.Y.
You did not tell me what make of oil you are using. Mobil 1 recommends every 15,000 miles, while AMSOIL’s full synthetic says every 25,000 miles. Not all synthetics are created equal; some have shorter drain intervals than others. The two longest are AMSOIL and Mobil 1. Make sure you are using good quality synthetic motor oil before extending drain intervals. Success to you.
I own a 2006 Buick Lucerne six-cylinder and I am considering going to synthetic oil. Do you recommend one brand over another? I was considering Mobil 1.
Jack from Depew, N.Y.
Mobil 1 is a great product. The other product I would put in the same class is AMSOIL. As a matter of fact, AMSOIL tops Mobil 1 in performance based on independent studies at Southwest Laboratories. See the stats here: www.lubedepot.com. Tom
Tom Torbjornsen is an automotive expert of 37 years. An automotive journalist in good standing with the IMPA (International Motor Press Association) and MPG (Motor Press Guild), Torbjornsen is the Repair and Maintenance Editor for AOL Autos, At Home Portals and many other websites. Please send your car questions to his website at www.americascarshow.com.