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      07-16-2016, 07:50 PM   #17
nachob
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Drives: 2011 1M, 2003 330i ZHP
Join Date: Apr 2008
Location: California

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Quote:
Originally Posted by OneM View Post
Direct injection cars usually recommend 30W oils coz of carbon build-up on the intake valves
Can you explain how/why 30 weight is key to direct injected engines?


The first direct injected engine was the wife's Mk V VW GTI and it came with 5W-40 and is the recommended oil to this day. Also the current M3/M4 is spec'd with the aforementioned BMW M 0W-40 oil.

Thanks!