Quote:
Originally Posted by Ecky
If you're feeling adventurous, you can always go even thinner, and send a sample off to Blackstone for analysis (metal content).
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I would only dare to do that with a Redline 30 weight (since they're A3/B3/B4), and if the oil cooler thermostat could be switched out to slightly lower temp. The thermostat is mechanical and opens at 102C.
If I knew for sure I wasn't going to exceed 4000rpm for the whole oil change, then a common 5w-30 might work. You do get diminishing returns, since the thinner oil could make it run under boundary lubrication conditions, and this engine has wide clearances which is why 10w-60 was speced.