Looking to see if anyone using these brands of oil are having issues with oil seal failures. we run 4 of these oils for our fleet and have started to notice some issues. I have found a lot of information stating that additives are not recommended for these oils as they do not have the capability to bond with the oil. I have listed the oils wed run below. Having a hard time finding any info on seal swelling and want to make sure we have all the info before going to another brand of oil. Fleet vehicles. Some range in the amount of driving so mileage varies a lot between vehicles. Cold temps sometimes as we are in Ontario. I appreciate all the info.
SAE 15W40 (Low Ash)
SAE 0W20 PCMO
SAE 5W20 PCMO
SAE 5W30 PCMO
SAE 15W40 (Low Ash)
SAE 0W20 PCMO
SAE 5W20 PCMO
SAE 5W30 PCMO