[Bigkk55]

My 2016 6 started using oil at 117,000 miles and I have no idea where it’s going. I am in the process of changing the alternator and discover oil on the back and bottom of the engine oil pan. Has anyone used Seafoam on their car? I plan on running MMO through it once I get it back together but was just curious if anyone else ever figured out any other reasons for the oil use all of a sudden. The car use to be my wife’s daily driver but it is now my two daughters shared car so it doesn’t get used as much and isn’t being used like me and my wife used it

 

[Bigkk55]

I looked it over really good. No issue with the oil filter seal and didn’t seem to be an oil pan issue. I honestly think the car has been babied the last two years and need to be cleaned out. I am going to add Mystery Oil to it and /or Seafoam it. I have done this to many of my past cars so I know how to use it and do it.

 

[Bigkk55]

I replaced the valve cover gasket and all is well oil level has stayed constant

 

[Bigkk55]

I've got a quarter-million miles on my 2015 and it has never consumed more than a half-quart over an entire OCI. I have never run ANY additive of any sort in the crankcase.

But I've always run 0w20 -- typically Pennzoil although Mobil 1 on some occasions and one or two jugs of Castrol -- which is always fully-synthetic. If you run partially-synthetic (e.g. many 5w30s) in the foolish belief that the 5w30 is "better" protection you can run into trouble.

Modern engines don't carbon because of "low tension" rings, they do so because to meet emissions the top compression ring is extremely close to the fire deck - it has to be because the tiny space between that and the top of the piston is "dead space" and any mixture in there will not burn well if at all. Decreasing this distance, which the manufacturers had to do in order to meet emissions, means the top ring runs MUCH hotter and that will coke non-synthetic or synthetic-blend oils, then the ring sticks and if you're LUCKY all you get is excess carry-up and high oil consumption.

If you're unlucky and the coking gets bad enough the ring will break or stick and score the cylinder wall.

Fully-synthetic oils cost a bit more money but in any engine built in the last 20 years they're basically mandatory whether the manufacturer says so or not and this is the reason why. (Some engines also will sludge like crazy under the valve cover with dino or blend oils as well, and that can also clog the screen on the oil pump pickup, degrade oil pressure and lead to catastrophic consequences particularly if all you have is an idiot light and no gauge, as is true for most modern vehicles. Both Honda and Audi engines are particularly known for doing this.)

Yeah 118,000 on ours never an issue then sudden drop. Valve cover gasket was leaking and in addition leaking into one spark plug. Oil being burned before getting out the tailpipe. Replaced the valve cover gasket and back to normal. It’s an easy job too