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The main reason why I switched to synthetic oil is because the Benz dealer recommended it when I brought my car to diagnose the ticking noise on the valve lifter. After I switched to sysnthetic oil, the ticking noise is gone. No oil leak and the engine runs quiter.
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94 E320 Silver 210000 miles
94 740il Pewter Green 97000 miles- Retired
05 S430 4Matic
07 Lexus IS250
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