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Message: <blockquote data-quote="Mouse" data-source="post: 281564" data-attributes="member: 2204"><p>stick back to your previous oil viscosity on the next oil change and see if the sound dissapear. how long have u been using the old plug? ask the mechanic to remove the plug and inspect if it need replacement, its relatively easy to see from the carbon buildup aroud the plug. but generally a platinum or irridium plug can last at around 30,000-60,000KM. regarding the correct viscosity for your ride, its very subjective because different mechanic have their own theory on what grade to use, some used 15w-50, some 5w-30, some 5w-40, some even 0w claming that the car run faster because its light. if u wanna play safe, use 10w-40, but there is only limited fully synthetic with that grade and its expensive such as redline, motul 300v chrono, royal purple.</p></blockquote><p></p>