WhatYaGot

Hi, I know this is an IS forum, but the IS and NX share the same turbo engine, My NX200t is my 1st turbo car I ever owned and wanted to know if I use Seafoam in the oil 500 miles before the next oil change if it can hurt the turbo. In my IS350 I used it in the oil and fuel and the valves were clean at 220,000 miles (I put a camera in the spark plug opening when changing the plugs.

https://www.clublexus.com/forums/sho...=863849&page=1


I understand the IS350 engine has the direct fuel injection vs this one that might be prone to carbon buildup similar to the IS250. I will be using Seafoam for my RC350, but wanted input on the NX. Thanks
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Moisture

First off, what exactly are you trying to achieve by putting seafoam into your crankcase? If you change your oil frequently and the mileage is low, you don't need to do that. Just put some into an empty tank, refuel and call it a day. Putting it inside your crankcase will do absolutely nothing for carbon deposits on your intake valves. I've discussed some good ways to keep carbon buildup in check on other threads, but if you'd like me to recap here, feel free to ask.

If you do put it inside your crankcase, put *some* right before you drive to the shop to get the oil changed. Make sure the car reaches full operating temperature by driving 20-30 minutes before changing the oil.

robawrench

I would only use any type of oil flush product if you have a build up sludge or other problem. Otherwise avoid them. While generally safe, they can cause problems with sensors or if the incorrect amount is added. Seafoam is just going to thin the oil to a lower viscosity weight.

Moisture

Exactly. In the case of a neglected engine which you suspect is sludged up or really any 60K+ mile crankcase which sees 5000 miles oil changes, you're going to see some buildup.

In that case I would do one oil change interval using Shell Rotella (cheap but highly effectively diesel oil) or Royal Purple. Both are known to do a great job making your crankcase new again.

E46CT

Just change your oil. It's a new car. Whatever carbon your engine is going to build is going to build anyway regardless of adding stuff to the oil. At about 60k, the 8AR-FTS is going to develop a substantial enough amount of carbon regardless of what man-splained oil or potion you use. No getting around physics. You'll just have to hope it doesn't cause misfires.

The best thing you can do for this engine is run it hot hard and often.