
Originally Posted by
SR20GTi-R
Some of the strongest running motors here were sludge monsters.
I would not worry about it unless you are doing a full rebuild.
This ^
I've seen sludged motors run really strong. Run some Marvel mystery oil and use 1000mile oil change interval or run some ATF and change oil after 20 minutes but aggressively cleaning it up might just fuck your shit up. Unless you tear the motor down there's not a lot to do.... compression test, leakdown, and pop the upper oil pan to check your rod and main bearings.
Honestly if its running good (MPG/power) leave it alone and enjoy the ride.