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Originally Posted by Ricamaro
If Blow-by is a consideration then could it be detected with a cylinder pressure gauge? What is the min-max cylinder pressure for the LS3 or L99?
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Leak down test is the only way and every guage brand will read slightly different. As a rull any more than 20% is considered an issue.
Quote:
Originally Posted by VR Baron
My 2012 M6 has 3400 miles, and little oil consumption, normal use I guess. catch can on for 2900 miles and only a little came out,about 1/4" deep in bottom of normal drinking glass.When I changed the oil I measuured what came out and had 7.5 qts, so some use, some still in the motor that doeant drain out.
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You have a good, properly ring seated motor w/out the valley baffel issues. Good job!
Quote:
Originally Posted by 90503
I too believe this is an area of concern. What I find interesting is how GM instructs what appears to be an incorrect way to break in the engine, as recommending the wrong type of oil! This is amazing and horrible if found to be true.
If so, I don't see how the outcome could be anything but a future class-action lawsuit, and/or a massive recall.
My experience so far, no catch can, only one oil change, no noticeable oil use...First car that's ever had full synthetic...I always believed full synthetic was somewhat of a gimmick to increase rated mpg, and that "regular" oil was perfectly acceptable as a substitute. I was also under the impression that engines these days were already "pretested/broken in" to some degree on the bench before assembly. Perhaps not.
Keeping my finger crossed and hoping for the best!! Thanks
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You will never see any auto maker to blame as for most the way they do it works acceptably for the vast majority of car buyers. Here in the performance world is about the only place people dig this deep to really understand and get this close to their car. Remember, most use their car for transportation and think of little else.
And the motors are spun on the bench for a partial break-in but for most this is not enough IMHO. Just think how confusing it would be to the 99% of car buyers if they were told to break in a new motor hard and then change conventional break-in oil to full syn at 1000 miles. There would be a revolt! They want to buy a car and out gas in and drive and not think of anything else until a service reminder pops up or a CEL.
And also, GM is far from alone with this....the list is long of most other manufacturers with similar issues. The chrysler hemis are so bad at oil ingestion they come with an integrated oil separator, but it returns the contaminated oil to the crankcase which is a no-no. The mini is a DI engine and talk to a BMW tech.....they have to remove the cylinder heads at 30-50k miles to physically remove the carbon & gunk build-up including a valve job. Allot can be prevented with a good catchcan as far as the most commond ingestion issues.
A suggestion, (very easy) remove your throttle body and look inside your intake manifold with a flash-light and use a clean white paper towel to reach in the snout. Even if you have no noticeable oil consumbtion my guess is you still have damaging ingestion that a can can prevent.
