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01 legacy 2.5l ; 5w20 vs 5w30; piston slap

08-21-2010, 04:35 PM
Has anyone tried 5w20 to reduce piston slap when engine is cold. Tried almost all grades except 5w20 and 0w30.

BTW, I always use synthetic.

Appreciate your thoughts.

08-21-2010, 11:05 PM
Reduce piston what? wear? Just use what the engine calls for, boxer engines are prone to lower cylinder/piston wear as is. If you change it normally you shouldn't have a problem.

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