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I have a 98 Tracer sedan, 135,000 miles. Today I put full synthetic in for the first time. For the firs time ever I can notice a tick with the hood up. It increases with the RPMs. Sounds like it is coming from the top of the engine. The dip stick reads full, no leaks. Am I worrying about nothing? Drove it about 20 miles no issues.
 

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injectors, perfectly normal.
 

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Sounds like hydraulic lifter tick. Not a huge deal, I have had one for a while and will address it when I do a cam swap though. Many syn. oils even though the same grade/weight are actually "thinner", having a different viscosity, they flow with less resistance. Many synthetic oils molecules are actually "smaller" and are suspect to increase leaks, or at least flow through them easier. Is there a possibility that tick was there prior to change and not noticed. I run a heavier oil because of the tick and many miles on original engine.
 
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