KeninBlaine

I've noticed lately that when I start my car after it has sat for a day or more, there is blue smoke out both exhaust pipes for about 20 seconds, then it goes away. I've only had the car for a few months, and am not sure if it always did this without me noticing or not. Is it normal for there to be some oil to burn off if the car has sat idle for a while? I'm not seeing any smoke when driving the car, even under hard acceleration. It is just at the initial cold start-up.

OverBoosted28

You'll read hundreds of threads on this. Just imagine how your engine sits (flat six)! While it does, oil (through gravity) migrates any where it can. A few different solutions (mods) may reduce it. But you're never going to completely eliminate it. Just drive it more often. If it worsens, then you need to start worrying, otherwise it's normal.

KeninBlaine

Thanks. I assumed that was the case, but just thought I'd check. I agree, I need to drive it more often!

Edward

Blue smoke after more than a week of sitting, yes, normal; after only one day...not so much.

As the car is still new to you, get a bead on how much the car is consuming oil. Take a mileage reading and look at the dipstick (remember, car is HOT, level ground, and idling), then record that. See what your dipstick reads after 1k miles, then another 1k miles after that. Pay attention to how much oil you're adding back (if any), and where the dipstick reads. This will give you some idea of how much oil your car is using. Oh, and you may also want to include here what oil/viscosity you're using ...which will clearly make a difference in your consumption.

The point is that oil seeping through the piston rings (and then combusted and blown out the tailpipe) is normal for a flat-6 that's been sitting for a while. But one or a few days of sitting should not produce a puff of blue. IIRC, the "official" consumption as per the gurus is no more that 1 qt. consumed per 800 miles. Now to me, that's a lot of oil and way past my own personal comfort level! But by the looks of your signature, you're no p-car newb so get a baseline for this 993 and see what ya get

Edward

KeninBlaine

Good idea. Will do. Thanks for the feedback.

stace

this is a solution;

http://www.rothsport.com/Products/En...eck-Valves.htm

Edward

You bet, kenin. Let us know whatcha find

Edward

OverBoosted28

These (one way) check valves are one of the "mods" that'll help. But as Ed stated, if it's rings you'll still get the "puffs".

PiB993

Do you know what type of oil is in your car? When was it changed last and have you happened to add any recently? A good 20w50 or 15w40 should work well. I can let my car sit for over a month with no smoke on start up.

nine9six

If there is an issue with rings, or oil consumption through the rings (not valve guides) the suggested solution is nothing more than a bandaid. Its like gauze wrapping a cancer tumor and hoping it cures itself...

At $300 bux, for the simplest valve known to man, its a ripoff as well.

Geolab posted a comment on this supposed "mod"

KeninBlaine

It is Quaker State 5/40 synthetic. I haven't added any since buying the car in late May. I think the last oil change was 17 months/1900 miles ago, but don't know what level it was filled to. Invoice shows 10 qts oil were used in the oil change. The current level on dipstick is about 3/4" into the twisted part above the untwisted end, or about 1/4 of the way up the twisted portion. My understanding is that it is best to not have the oil level about half way up the twisted section. I know I can likely do a search, but can someone calibrate the number of quarts represented by the twisted section of the dipstick? In other words, to bring my level from 1/4 to 1/2 way up the twisted section, roughly how many quarts?

I drove the car last night, and when I started the car this morning there was no smoke. I will try to monitor how long it sits before there is smoke at startup.

Thanks for the responses.

TJ993

When I first got my car, 3 + Years back I had an occasional puff of smpoke on start up.
Turns out the car was On An Angle - about 1 foot down on one side. Got her level and it went away.

My car needed a Lot of maintenance when I got her.
Might that be an issue for you?
ie: Plugs, wires etc
Depends on Mileage and Maintenance History - if u know it?

]It is Quaker State 5/40 synthetic.

Some people believe a 10 w -40 weight Minimum

I use Mobil 1 15w-50 spring 60 degrees and after 75 20W-50 Mobil 1 V-Twin
I do not want to start an Oil Thread here But 10w-40 minimum

Invoice shows 10 qts oil were used in the oil change.
NORMAL REQUIREMENT 10 OR 10.5.

My understanding is that it is best to have the oil level about half way up the twisted section.
yes Try to do this - Good Practice.

I know I can likely do a search, but can someone calibrate the number of quarts represented by the twisted section of the dipstick?
I believe thats 1 full US Quart

To bring my level from 1/4 to 1/2 way up the twisted section, roughly how many quarts?
Not Quarts But likely 250 Ml or (1/4) One quarter of one quart

I drove the car last night, and when I started the car this morning there was no smoke. I will try to monitor how long it sits before there is smoke at startup.
Good Idea.
Thanks for the responses.[/QUOTE]

KeninBlaine

[/QUOTE]
Mine doesn't appear to need any maintenance. It has religiously had oil changes, brake line flushes, etc. virtually every year over the past 10 years, regardless of miles. It also had top end rebuild about 10 years ago, including rings, plugs, distributor parts etc, and runs very nicely.

OverBoosted28

Yeah, I saw those a while back and thought the price was ridiculous. Is the $300 bucks gonna assure this valve NEVER fails? Cause if it ever does fail, your engine dies a horrible death.

993C4Smontreal

I JUST went through the same thing. Mine was a simple fix, I hope it does the trick for you:

https://rennlist.com/forums/993-foru...r-smoking.html