Hi all, This is my first forum post.

I just changed the oil in my wifes 2019 RDX SH-AWD Advanced Package for the first time (dealership had done all previous oil changes). Car has about 50k miles on it. All regular maintenance has been performed. I drained the oil and filled a 5qt jug up to the very top of the opening which I would guess is about 6qts... this didn't include what was still in the filter. I'm guessing around 6.2qts in total which is alarming considering the 5.1qt capacity. After reading some posts on this forum I went back and smelled the oil and it REALLY smelled of gasoline and seemed a bit thin. Of course when I called Acura... they acted like they had never heard of this before. They want $200 just to diagnose the problem, but I worry they will just tell me there is nothing wrong. There are no engine or warning lights. Car seems to drive fine for now, though the gas milage isn't quite what I thought it would be.

I have talked to 2 mechanic friends. One said it could be the fuel pressure regulator which would be covered under the power train warranty, but I didn't read about that as an issue in any of the posts on this forum. It sounded more like a common issue with direct injection turbo honda engines. My other mechanic friend who is a Honda guru said he used to have this happen in his S2K all the time... though I doubt it was to the extent that the oil is being diluted 20%. He swears that if I let him put an oil catch can in that draws vacuum it will solve the issue. He said he was "1,000,000% sure". Any thoughts on this?

As a side note, he told me to get the oil catch can and also a PCV Delete breather (See link). https://kmotorperformance.com/shop/1...ather-adapter/
However, the PCV delete says it is only good for RDX's up to 2018. All the oil catch can posts I have read on here just talk about using PCV hose, but nobody has mentioned this PCV delete breather. Is my friend onto something or is he an idiot? More advice/input on this would be much appreciated.

 

Since you are changing oil for first time, it could have been overfilled last time. I doubt there us anything wrong with your car in particular, it is a fuel diluter like others. Start using thicker viscosity such as 5w-30 or 0w-30, and change oil every 3-4k miles

 

I got similar issue, about 1q gas leaked in the engine oil after just 3000 miles in 7 months.

Plan to change more often with 5w30 next time.

 

Hi, was this ever resolved? We have a new to us 2021 RDX with 110,000 kms that is putting a serious amount of gas in the oil - first oil change by us at 9,000 kms had overfill of 1.2L. The next oil change at 6,000 kms had 600 ML. Acura says this is perfectly normal. Car sits in a heated garage, and we live 15 mins out of town so its always completely to operating temperature. I had it in to Acura in Saskatoon, their suggestion was new spark plugs at 99,000 kms, which I did, and to run only premium, which we do. I just checked the oil again, and after 3,000 kms it's way overfull. I can't see how this can be good for the engine in the long run! Long time Honda fan here but this has me doubting our purchase. Love the vehicle otherwise.

 

Spark plugs have nothing to do with this.
Seems like another dishonest dealer trying to make money in giving you false hopes.
There is no fix. It might be addressed in next gen design of 2.0t.
You can mitigate by changing oil sooner, using thicker viscosity and running car longer.

 

Totally agree on the spark plugs. I did it myself for half the cost they suggested, and I did it just to appease them. I just don't see how 20+% dilution is acceptable. I read that it can happen on direct injected engines due to short trips, but we do not do short trips with ours.

 

yours seem more severe than others.
I dont want to scare you, but perhaps as engine is getting older and you have more wear on your cylinder walls and/or piston rings, and that leads to more than others…