Recommending the best synthetic oil

[2015genesisNewbie]

WOW! New member, and I have read this entire thread (including links) with interest. Gets a little contentious occasionally, but as long as it doesn't get out of hand and remains at least PG rated, I appreciate the passion. I am very grateful for all the research, and the depth of knowledge and commitment to sharing accurate information when you are presenting your opinions. Not really looking to resurrect this thread, but I do have a question/problem that I think is oil related.

My 2014 3.8 GDI has Constant Variable Valve Timing (CVVT), I think all Genesis engines do. It is operated by oil system pressure acting on cam actuators. When first starting car in the morning, it idles/runs rough for 30 - 60 seconds then smooths out. Won't do it again until it sits for several hours. Does anyone else experience this? Is it normal? Will the oil you use make a difference? Car is still under warranty, but dealer says they cannot duplicate...may try again when colder.

Thanks for input.

Update please. I have a 5.0 that does the same. It’s almost like a slight misfire but no check engine light no codes and other than that runs fine

 

[2015genesisNewbie]

Changed oil this past week using 5W-30 full synth. Will evaluate going forward for rough idle. Try to update later.

?

 

[Ozy44]

Update please. I have a 5.0 that does the same. It’s almost like a slight misfire but no check engine light no codes and other than that runs fine

Have you tried cleaning the throttle body and throttle plate?

 

[2015genesisNewbie]

Have you tried cleaning the throttle body and throttle plate?

Yes. With carburetor cleaner. Didn’t really have any build up to begin with but did it anyways.

 

[toxicavenger70]

Yes. With carburetor cleaner. Didn’t really have any build up to begin with but did it anyways.

You should remove it and clean both sides of it.

 

[toxicavenger70]

I use Costco Kirkland Synthetic. It works great.