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Message: <blockquote data-quote="MONTOYA" data-source="post: 77114" data-attributes="member: 1086">If your car is well maintained. not too old a 5W-30 provides good protection esp. during cold start. Infact, it give good FC or better mileage. Equally it provides all the necessary protection too. I refer to full synthetic oil here.Too Thin? No. read your manual, most Continental car recommends this grade for their factory fill.If you are using a thicker oil like 20W-50 you are likely to get a bad mileage i.e wasting petrol, without necessarily increase the protection of the engine. of course, unless you have worn piston rings, leaking and faulty seals etc.</blockquote>