Look at the front of the radiator, are the fins all bent and damaged? Usually this will not cause any a problem with normal use-age, but obviously your speeds are above average so you may have a weak radiator, clogged rad, poor flow to the rad (leaves, debris, bent fins, etc) all these things can cause poor cooling issues at those high speeds. I am definately leaning towards a poor radiator for this issue.
As for your oil consumption, you may have an internal problem. It may be, valve seals, piston rings, cylinder walls, etc. For this problem, I would first check for an oil leak (cam seals are common, oil pan gaskets are also) if there are no leaks then I would investigate the PCV system. Is the valve functioning properly? Is the vacuum source collapsed? If all these checks are good, then I would do a cylinder compression test. Even if the compression test checks out, you still may have a valve seal problem! With your type of mileage there are many possibilities to where your oil is going. Do some checks and reply back for further guidance!
Tuesday, November 25th, 2008 AT 5:05 PM