Originally Posted By: fdcg27
Originally Posted By: jaynissan12
One is meant for a long run and one isn't. Choose based on how long you want your OCI to be. If only going 6-7K miles, QSUD is your ticket, if you want to extend out to 10K then mobile or castol edge gold would be your ticket. Even Pennz Platinum Plus would take you to 10K. So you have more than two options. Everyone is going to have a preference, me I personally don't like mobil over some of the other oils but I'd use it and not bat an eye afterwards.
This isn't actually the case.
Reasonable OCI length has more to do with the engine and how its used than it does the oil.
The guy doing 10K drains on two cars with M1 AFE also puts a lot of miles on both, just as an example, so likely does a lot of miles per start.
If it took him a couple of years to hit that 10K, then that might not be a reasonable drain interval based upon fewer miles per start.
Its both, obviously things need to be reasonable but as long as he is driving it and it isn't sitting in a garage while fuel combustion byproducts turn the oil more and more acidic, then he is fine. If it is a daily driver or whatever, yes what I said prior to this message applies. Some oils are made to keep the TBN longer, mobil is one of them.