Carbon Build-Up on Intake Valves... 60,000Miles+
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olgzr (01-17-20)
01-17-20, 07:45 AM
#47
Lead Lap
Generally speaking as long as you avoid short distance trips and driving around with a cold engine as much as possible and change your oil very often (more than 5000 miles...) You're not going to experience much buildup.
0w20 has been proven to cause extra blowby (and carbon buildup) so as long as you avoid using it, I think the intake ports will look clean well past 60k miles.
0w20 has been proven to cause extra blowby (and carbon buildup) so as long as you avoid using it, I think the intake ports will look clean well past 60k miles.
01-17-20, 11:36 AM
#48
Lexus Fanatic
Just do what the manufacturer suggests. Everything that poster has said here is entirely his own "opinion" with no evidence to back up anything he's saying. Don't listen to him, listen to the manufacturer of the car.
01-17-20, 11:59 AM
#49
Intermediate
Originally Posted by Moisture View Post
"... 0w20 has been proven to cause extra blowby (and carbon buildup) ..."
Please provide data to prove 5W-whatever is better than specified 0W-20 and the data that proves that 0W-20 to cause extra blow-by. Without concrete data, it is all just opinion/speculation and fantasy, that only can cost big $$ when/if your car engine suffers major failure and dealer declines warranty service.
"... 0w20 has been proven to cause extra blowby (and carbon buildup) ..."
Please provide data to prove 5W-whatever is better than specified 0W-20 and the data that proves that 0W-20 to cause extra blow-by. Without concrete data, it is all just opinion/speculation and fantasy, that only can cost big $$ when/if your car engine suffers major failure and dealer declines warranty service.
01-17-20, 03:52 PM
#50
The thicker oil will only maintain a better film strength for as long as the oil additive package which was blended into the oil will allow for.
Bottom line - 5w40 oil is still going to be better than 0w20 no matter what. But if you're using thicker oil which is actually proven to have real world fuel dilution fighting properties that is absolutely the way to go.
While I don't know exactly how hot the NX300 runs, I imagine the temperatures are reasonable; but... remember that the oil goes through the turbo which is then subjected to insane temperatures. Due to this fact alone I would not hesitate to go thicker than 5w40 during warmer weather.
Bottom line - 5w40 oil is still going to be better than 0w20 no matter what. But if you're using thicker oil which is actually proven to have real world fuel dilution fighting properties that is absolutely the way to go.
While I don't know exactly how hot the NX300 runs, I imagine the temperatures are reasonable; but... remember that the oil goes through the turbo which is then subjected to insane temperatures. Due to this fact alone I would not hesitate to go thicker than 5w40 during warmer weather.
01-17-20, 04:24 PM
#51
Originally Posted by Moisture View Post
"... 0w20 has been proven to cause extra blowby (and carbon buildup) ..."
Please provide data to prove 5W-whatever is better than specified 0W-20 and the data that proves that 0W-20 to cause extra blow-by. Without concrete data, it is all just opinion/speculation and fantasy, that only can cost big $$ when/if your car engine suffers major failure and dealer declines warranty service.
"... 0w20 has been proven to cause extra blowby (and carbon buildup) ..."
Please provide data to prove 5W-whatever is better than specified 0W-20 and the data that proves that 0W-20 to cause extra blow-by. Without concrete data, it is all just opinion/speculation and fantasy, that only can cost big $$ when/if your car engine suffers major failure and dealer declines warranty service.
Besides, we all know the manual specs out how thick of oil to use; newb looks for 5T50 (T is for 'Thickness'), but can't find it; goes to ebay and it's not there either. Dam! Well when I do find it; I'll fill the crankcase full and all my deposits will go away! LMAO!
Is it raining trolls? Is that possible? NO clue what this cats motive is but there is a lot bad advice being given to people who know nothing about cars and it's just wrong to post as if they are the SME purely for sake of entertainment. Especially when they have never even worked on a car!!!!
This thread should be deleted along with OP!
Last edited by 2013FSport; 01-17-20 at 04:27 PM. Reason: SME subject matter expert
01-17-20, 10:49 PM
#52
Just curious, if carbon build up on NX are common because it's turbo?
01-18-20, 11:00 AM
#53
Lexus Fanatic
01-18-20, 04:12 PM
#54
Intermediate
NX engine has injectors in intake manifold as well as for direct injection. This should help to minimize carbon build-up.
01-18-20, 04:17 PM
#55
No, direct injection engines have had issues with or without turbos. In port-injected engines, gasoline and detergents flow over the valves on the way to the combustion chamber and keep them clean. With direct injection, fuel is injected directly into the cylinder and doesn't clean the valves. Motor oils that meet Dexos 1 Gen 2 are supposed to have additives to prevent carbon buildup. Time will tell...
01-18-20, 04:19 PM
#56
Simplistic explanation: Carbon build-up happens when sump oil via PCV is directed to intake manifold (why, is completely different explanation) and ended up on the back of intake valves, where it is baked on due to high temperature. It happens gradually. Gas can wash it off, but with direct gasoline injection in cylinder, gas does not come via intake valves anymore. This is complete irrelevant to turbo.
NX engine has injectors in intake manifold as well as for direct injection. This should help to minimize carbon build-up.
NX engine has injectors in intake manifold as well as for direct injection. This should help to minimize carbon build-up.
01-19-20, 06:36 PM
#57
"Moisture" posting under another ID. I am banned.
No, direct injection engines have had issues with or without turbos. In port-injected engines, gasoline and detergents flow over the valves on the way to the combustion chamber and keep them clean. With direct injection, fuel is injected directly into the cylinder and doesn't clean the valves. Motor oils that meet Dexos 1 Gen 2 are supposed to have additives to prevent carbon buildup. Time will tell...
01-20-20, 03:58 PM
#59
"Moisture" posting under another ID. I am banned.
01-20-20, 04:29 PM
#60
Lexus Fanatic