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Message: <blockquote data-quote="pangyau" data-source="post: 4238331" data-attributes="member: 82450">hope this might help.The downsides of such a thick oil (when not specified) are as follows: Additional friction, heat and wear. A reduction of BHP at the wheels Lower fuel consumption The thicker the oil is the more friction and drag and the more power the engine needs to move it around the engine which inevitably translates to less at the wheels. Well, you will probably need 5W-50/10w-50/15W-50 but only in these circumstances. 1. If the car is heavily modded and heat/oil temperatures are excessive. 2. If the car is used on track and heat/oil temperatures are excessive. 3. If it's required by the handbook.In a worst case scenario with thick oils (when not required) is that you will experience air entrainment and cavitation inside the bearings at high RPM. Not clever stuff!I know this is technical stuff but oil is a combination of science and engineering and few people know enough about it to make an informed choice. Just because your mates use it and have had no problems is not a good enough reason to use it, your engine would prefer and benefit from the correct oil.Collect the data from the website & very useful for me all these years...</blockquote>

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