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.
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.