I just bought this "99" concord, it has 173,000 miles, has been using Pennsoil
What is your question?
This car has been well maintained, regular oil changes @every 3000 miles. Has always had 10-30 or 10-40 Pennsoil used in it. I am a fan of Castroil and would like to use it. Question is will changing to Castroil from Pennzoil cause any problems on this high milage engine? I have over hauled engines that have used Pennzoil, so I know that there is a lot of "varnish" and sludge. Will Castroil be a viable option? Also what about synthetic oil??
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I doubt the car will run any different using Castrol. Both oils meet the same specifications. I'm not sure I would switch to synthetic oil with 173,000 miles on the engine.
