Tons of blue smoke out of exhaust after oil change.........

[alright2020]

89 240 with sr20detthis happend right after swapping turbo out for a fresh oneright after the turbo swap it was fine it happend once the oil was cahnged

My friend changed the oil in his 240 and switched from conventional 5w30 to royal purple 5w30...may have filled it up a little to much so he drained it down to the right level and ran it again and it still smoked. thought it may be the oil so changed it back to conventional but decided to go thicker with 10w30 cause he thought the synthetic 5w30 may have seeped through the rings....but still constantly blows blue tinted smoke...

[del82]

Synthetic isn't necessarily "thinner", but on a microscopic scale the synthetic oil is more uniform in size compared to conventional oil, normally this means it seeps thru seals and by worn out rings easier.

If I were going to guess, i'd say you've swapped in a lightly (or maybe not so lightly) used turbo engine, and you'll need to change the valve guides and seals. 'Course, the overfilling could be a problem too, how long has it been smoking since you overfilled it? Week or so?

[alright2020]

the car was all good until teh synthetic oil. car has only been driven a couple times since becuse the problem is unsure and dont want to make it worse...

[Drift40]

If the car has been run on non synthetic oil most its life and you start running synthetic it is normal for it to start burning cause synthetic will blow by easier and if the rings are not in the best of shape they wont scrape the oil off well enough. Id keep using a non synthetic untill you rebuild your engine.

[Cone Junky]

If the car has been run on non synthetic oil most its life and you start running synthetic it is normal for it to start burning cause synthetic will blow by easier and if the rings are not in the best of shape they wont scrape the oil off well enough. Id keep using a non synthetic untill you rebuild your engine.

And you know this how? Synthetic oil myths are stupid and unproven, please don't spread them anymore then they already are.

Most likely the smoking came from the overfilled oil. Now the cat is covered in the oil and will take time to completely burn off.The fact that it started shortly after a turbo swap is bad news too. There is always a chance it is worn out, but I would drive the car more to make sure it's not just the cat.

[Drift40]

Well im just stating what i learned in my engine theory class. Not trying to spred any myths thats just what i learned.

[Jaino40]

Lol.No fence.But Engine Theory?Theory...I want to take a class thats called Engine FACTS. Not theory. lol.Wait.. I go to wyotech.FCKK Wyo.

[del82]

You don't like Wyotech? I thought it was rather nice...heh.He's right about the oil, same thing I was describing, really. I'd say if it doesn't stop smoking within the week, to change back to regular, or re-ring and hone the engine, and put in a new gasket set. His problem sounds a bit more involved than the small amount of smoking that normally comes from using synthetic in an old engine, though.

[Cone Junky]

Worst case scenario-synthetic oil slips past the rings a little more than dino oil. Even if there was any fact to that, it would be very slight. More like burning 1 quart every 2000 miles vs. burning 1 quart every 3000 miles, if even that much of a difference.There is no possible way that synthetic oil can make a fine running engine turn to blowing "tons of smoke out the tailpipe". If it were true, then just about every manufacturer wouldn't be putting in synthetic oil from the factory.

Don't believe everything you hear. If it were a documented and credible independent study, then you can believe it. Teachers and instructers tend to believe what they were taught/told a dozen years ago. I remember being told you can't mix dino and synthetic and you can never switch back to dino oil after synthetic. Both of which have been repeatedly proven wrong. Notice they sell synthetic "blends" off the shelf now...

[Drift40]

Well im not saying synthetics are bad, thats all i run in my car just on an older engine that hasn't been using synthetics is gonna smoke some. I dont know your idea of a ton of smoke so i figured i throw this one out there. As for my teacher hes learned that though experience out in the field.

[Vegascorbin]

My two cents:You two guys are compairing Apples and Oranges.Drift40 is talking about a WORN engine.Cone Junky is taking about "a fine running engine". Both of you are correct. Synthetic, due to its uniform size, will pass through gaps and or openings easyier than regular oil. NORMALLY this is not a problem, and in fact is one way it is able to lube better.

However, if you have gaps that are oversize or you have more of them than regular, you will consume more Synthetic than regular oil. THIS IS DUE TO THE ENGINE AND NOT THE OIL.

Both of you are correct.

Both oils have advantages and disadvantages and each user must decide for themself which is best for their aplication.

[tercel drifter]

oil is not the problem, motor is... valve seats or rings are worn...

[Cone Junky]

According to the OP, the car was running fine and then all of a sudden started "blowing tons of smoke" (it's in the title...).There is no way that a car that was not blowing any smoke would all of a sudden start blowing "tons of blue smoke out of exhaust" due to just switching to synthetic.I did mention that oil consumption might increase a little, but not pour blue smoke out the tailpipe. Worn engine or not.

Anectdodle stories from one shop teacher is far from preaching the truth. Just because they are an instructer doesn't mean they know every(any)thing. The only problem with synthetic that seems legit is to not use it on break-in of a new engine. Due to the fact that it is so effecient at reducing friction, the rings won't seat properly.