I'm not doubting that towing is severe, just wondering why...
Assuming good air filtration, what does towing all summer as I do, do to oil to be considered severe?
If the cooling system is working properly, I wouldn't think heat would be that big of a factor?
Is it the extra RPMs that would mimic longer miles of non-towing OCIs?
Is there extra pressure (like PSI) being exerted on the oil?
Is shearing to a lower grade the only concern?
Assuming good air filtration, what does towing all summer as I do, do to oil to be considered severe?
If the cooling system is working properly, I wouldn't think heat would be that big of a factor?
Is it the extra RPMs that would mimic longer miles of non-towing OCIs?
Is there extra pressure (like PSI) being exerted on the oil?
Is shearing to a lower grade the only concern?