Originally Posted By: Quattro Pete
On my car, it only goes by fuel used. But when you think about it, this kind of already takes into account a whole lot of other factors. For example, lower temps = higher fuel consumption as the car takes longer to reach operating temp. City driving or spirited driving also equals higher fuel consumption.
My only problem is that arbitrary 2375 liters per OCI (475 liters per dot) number that they came up with. 2375 liters = 627 gallons. If I average 25 mpg, that's nearly 16K miles per OCI. Seems a bit much, but then again, it has a big sump. Maybe it's doable.
I agree with you that fuel used does allow it to account for probably 95% of the way people drive.
Given that you're running some of the world's best oils (BMW spec)I think a 627 gallon calibration would cover the car really well. As you said it could be up to 16,000 miles at 25mpg or it could come down around 10,000 for city drivers.
A big sump, full of a European grade synthetic, is the holly grail of protection.
I don't think the OLM properly accounts for the severe service that Overkill experiences by merely counting down gallons used however. I'm assuming that his OLM is virtually the same as yours in how it counts down, given that the cars are a model year apart. Say he gets 12.5mpg that still brings him to the 8,000 mile mark. That just allows for way too much fuel dilution in ice cold, extreme short trip, cycles of operation.
Finally, I must again question that his OLM is working properly to begin with. Using your numbers, even if he was getting 25mpg (impossible for an M5 under these conditions) his OLM couldn't be on the first dot after 6000 miles. Plugging his actual fuel economy in - that's even more evident. Shouldn't it have been on the last dot by the time he changed it?
