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My car burns oil really bad

4K views 9 replies 6 participants last post by  KStromberg 
#1 ·
Hello everyone. I just did an oil change today and man, is my car really smoking. It has smoked before but never like this. I decided to go with filly synthetic oil since I do have a lot of miles on it. Well, needless to say, the burning got worse. Before, i would have to let it sit idling for about 3 to 4 minutes before I hit the gas and smoke would come out. Now it only takes 2 minutes before it really smokes. Was changing over to synthetic a good move? Or is it something else I should be worried about?
 
#4 ·
the -96 4.6 V8 had problems with valve seals going bad prematurely, it sounds like that is likely the problem w/ yours. It's probably coincidence that you notice it more after changing to a synthetic, or maybe synthetic burns differently (more smoke) than regular oil.
 
#7 ·
A mechanic advised me not to use full synthetic oil in older engines. I used synthetic in my '98 cv and it definitely burned more oil. Since then i switched back to regular 5w30 and its better now but still worse then before the synthetic. Engine had about 175000km then.
 
#8 ·
Personally, I had a 91 Town Car with the same issue and indeed it is valve seals. I switched from 5W30 conventional to 10W30 synthetic Mobil 1 and my oil consumption went down HUGE. Almost half of what it was. I attribute that more so to the change in weight rather than going from conventional to synthetic.

In my opinion, if you are seeing increased oil consumption, I would go with a heavier weight oil but still run 5W30 in the winter. Going to a heavier weight like 10W30 will fill those gaps in the engine that have grown larger from age. You WILL notice less consumption. I did.
 
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