Over a year ago, at about 58,000 miles on the odometer, my 2003 4-cyl. Toyota Highlander had burned through virtually all its oil 6,500 miles after the previous oil change. After a year of observation and 3,000-mile oil change intervals (during which it loses about 1.5 quarts), the dealer diagnosed…

Replace rings/valve seals or keep replacing oil?

Docnick May 1, 2008, 1:57pm 7

Either just replace the valve seals (not by the dealer) or just keep driving the car; 1 quart in 2000 miles will not foul the spark plugs.