swaangin

I read some places on the forum (wish I bookmarked the page) but I noticed someone said when they get their oil changed they get something else changed to help prevent the carbon build up in our direct injected type engines? Can someone give me some insight on what it is to prevent that? I heard the newer generation of the 2.5 v6 (2015 IS 250) fixed this issue in the second gen IS a few years back.

E46CT

Yeah we have port injection hybrid with direct injection. So basically we have fuel sprayed into the intake tract to help keep valves clean. It should be fine. Just drive and don't worry.

loophole35

The problem only existed on the 5w30 motors the 0w20 motors got revised piston rings and PCV system to combat the carbon buildup. I would still recommend to run 91+ octane though as it burns cleaner and that will help prevent carbon buildup on the piston tops.

E46CT

Also don't baby your cars. Run them hard to redline often. You put around on short trips and that's when problems arise. probably 95% of lexus drivers do this which doesn't help already carbon-sensitive engines.

arentz07

For the dual-injected engines, does the occasional pull help in any way as it would with a direct-injected one? Just curious.

E46CT

Absolutely. Also prevents moisture in the oil and gets the cat nice and hot. It's all around good for the car. Pretty much all owners manuals of all cars say to avoid short repeated trips.

Also I would say to wind out your engine a little more than occasionally.

think of it like doing the dishes. they clean a lot easier when hot. same concept

arentz07

Haha, don't worry, I wind out the engine, as you say, on a regular basis. But yes, that makes sense. And for me, since my commute is typically 15-20 minutes, I probably do need the extra heat sometimes especially in winter.

Xanadu350

Solara350

Like other said above, IS250 year 2012+ engine has been upgraded, you're actually be fine, but if you want to baby your Engine, 46 said it there, fill up TOP tier gas, go WOT sometimes avoid short trip, use only Synthetic engine oil, if you can put an "Oil Catch Can" right at your PCV valve, Turbo Engine is same as non-turbo , if your car is Turbo 200T, i suggest get a good oil catch can. I don't know why ...Lexus discontinue 2.0T Engine, now most Lexus 3.5L. All i can sat is "Drive like BMW Drivers" here to Video for BMW Class Lesson (how to be a BMW driver) have fun LOL these guys are my favorite from England

loophole35

Lexus did not discontinue the 200t engine. The IS/GS/RC/NX300 are all the 200t (with the exception of the AWD cars).
http://www.lexus.com/models/RC/specifications
http://www.lexus.com/models/IS/specifications
http://www.lexus.com/models/GS/specifications
http://www.lexus.com/models/NX/specifications

Jeff Lange

iTrader: (1)

All Lexus did was rename the 200t cars as 300, the engines did not change in any models.

Jeff

loophole35

AWD IS, RC and GS are 3.5L motors.

PK Auto Design

Great advice! I notice even on my personal cars, if I just put put back and forth and don't open it up, they don't run as nice. Some of you will remember, Ford was having a similar issue on early ecoboost V6s, specifically in Explorers in colder states but not as commonly in F-150s and cars in states that don't have a real winter. They could not figure out why it was effecting Explorers and not the trucks, and what was causing so much carbon build up on the valves they would in extreme cases misfire. Well, most of the Ecoboost testing was hard core, wide open throttle abuse and they never did any long term testing of overtly gentle use, as with any if not all manufacturers. Basically the average Explorer driver was just creeping over to the store, dropping the kids off, and going through short and very gentle trips, while the F-150s were getting driver significantly harder. These cars were in cold environments and on short gentle drives were commonly not even reaching operating temp. Durability testing for cars in most cases consists of trying to simulate years of hard abuse in a short period of time, which does not test the conditions of the gentle driver. I imagine it is no different for Lexus in this case. Long story short DRIVE YOUR CARS HARD PEOPLE.

Jeff Lange

iTrader: (1)

They always were, nothing changed.

Jeff

arentz07

Except for the IS 250 AWD.