Mobil 0W-20 at 5k; 30k on Lexus LS460

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Originally Posted By: troyh
Someone please help me understand this. Almost 5K and the TBN is 3.1 Blackstone suggests going another 2K, making a 7K OCI with M1. Aren't others doing that well or some better with a dino oil like PYB?

I would definitely try another syn other than M1.


Unless we see a PYB UOA for this specific engine with this specific usage it's impossible to tell. With a TBN of 3.1 after 5k and a starting TBN of 8.8 if I remember right, this oil is not even close to spent. 10k may be doable but again, small increases over time are safer.
 
Air filter was new. I picked up a case of Toyota 0W-20 Synthetic at the local Toyota dealer for $5.85 per quart. I'll run out the M1 for another 2000 miles then install Toy. I'll sample that at 5000 miles and report back...but that will be 7-10 months from now.
 
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