Quote:
Originally Posted by torqueaddict
They said the same thing about the Mazdaspeed 3 Disi engines. Never happened.
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People tend to say this about all direct injected engines, but that is definitely not the case. In most cases, it is a small displacement engine with boost. This causes more blowby past the rings, which causes more oil going through your PCV system (smaller amount of ring surface area, and more combustion pressure (in terms of pounds per square inch)). It is also a big problem in engines that are know to go through oil between oil changes. If you aren't losing any oil between oil changes, you probably don't have as much oil on the backs of your valves as someone who has to add a quart between oil changes.
The LT1 is not a small displacement engine and no boost. Plus there is a built in oil separator in the valve covers that was redesigned for the Camaro engine over what the Corvette got.
You can also get a catch can to help reduce the amount of oil going into the intake.
You can also use a product like CRC or Seafoam's upper engine cleaner. There is a hose that you put into the intake to spray cleaner through the throttle and into the intake manifold, so it cleans the backs of the valves. I have used both, and like the CRC product better. Worked wonders in several cases (two engines that were over 150k miles and were getting worse gas mileage, a tiny bit of hesitation, and needed to be turned over longer to start). Problem instantly solved Got noticeably better gas mileage as well.
I would recommend using this as a preventative rather than a cure for long term deposits, even though I used it as a cure for some issues. As a preventative, it will work more optimally.
In the end of the day, direct injection is not the cause of the issue, it only amplifies the issues cars get from consuming too much oil by a bunch.