That's because when a car isn't used for a long time, the oil drains in the heads causing the lifters and valves to make that noise. When you use thinner oil, it gets inside and the friction causing this sound disappears.. 
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Danny
1994 Silver SVX in hybernation, awaiting for the monsterous awakening (Lebanon) 
1967 Mercedes-Benz 250SL Euro Specs, Hard/Softtop, White/Red. Under Complete Restoration 
2013 Mercedes-Benz SL350 Euro Specs, White/Red. Mint... Another step into SL Collection. 
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