Join Date: Jun 2013
Location: New York
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I'm new to subarus... But on all the dsms I have tuned the knock sensor would pick up lifter tick (same as subaru tick, has to do with lifters and oiling)... If subarus have decently sensitive knock sensors you could be pulling timing sometimes due to the sensor picking up the tick... I always went with 5w40 or even thicker oils and it seemed to quiet it down and keep it quiet enough to get the knock sensor to shut up.
But the rest of the guys are right, post a video of it... Most likely it's a loud lifter tick...
In all my cars I've either used 10w40 royal purple or 5w40 rotella t6, and I always use the engine restore stuff, I don't believe that it restores horsepower or anything like that, just in my experience with ticks and tuning the addatives in it has helped tremendously with valvetrain noises...
If I were you I'd go to some rotella t6 full synthetic and a can of restore, along with a good filter.
Just my $0.02
Also be aware that tensioners can make slapping noises, when's the last time you've had your timing belt done or at least checked the tension? That could cause major problems.
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