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Ford dealer in Bahrain use 10w30 oil instead of 5w20 in my escape 2.5 L4 2012. Due to this, i have tappet sound or VCT sound when the engine is cold after 12 hours for 2 minutes . they said , it is a normal sound and the oil needs time to circulate. therefore , I need opinion in this matter of issue . the sound appear after first oil change and the sound is louder during this winter .