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So recently I completely rebuilt the 2.3 L in my Mazda 3. Everything went as planned and double checked everything so no issues with that, I switched over to synthetic 5w-20 oil over the regular 5w-30 the previous owner used in it. Since the rebuild (1k miles ago) it has started to smoke and burn a little bit of oil (half a quart every other week) . I was wondering if you guys had any ideas, it's blue smoke and does it at random times.

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So recently I completely rebuilt the 2.3 L in my Mazda 3. Everything went as planned and double checked everything so no issues with that, I switched over to synthetic 5w-20 oil over the regular 5w-30 the previous owner used in it. Since the rebuild (1k miles ago) it has started to smoke and burn a little bit of oil (half a quart every other week) . I was wondering if you guys had any ideas, it's blue smoke and does it at random times.

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Blue smoke is oil. Rings might still be bedding in but if you're concerned do a compression test. Could be rings or valve seals.
 

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Did you have the head or the block machined with this rebuild, or were you just installing new parts into an un-machined older block and head?
 

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They were machined, not my first time bud
Just checking! It's always a sad story when someone says they did a lot of engine work on their car and then it won't start. They come onto the forum trying to get help with their non-start issue, and then we come to find out they didn't know they were supposed to time the engine... ouch!
 

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Yeah that'd suck lol
Just checking! It's always a sad story when someone says they did a lot of engine work on their car and then it won't start. They come onto the forum trying to get help with their non-start issue, and then we come to find out they didn't know they were supposed to time the engine... ouch!
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Rings will not seat using synthetic oil, the film strength is too high. Drain & fill using regular oil for a few K miles to stop the burning oil.
 
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