I'm getting a remanufactured Cat C-12 put in my semi truck and the filter Cat calls for is 1R-0716. Cat doesn't publish filter specs anymore and this filter is listed as "standard efficiency", it crosses to a Donaldson P554005 and is listed as 40u absolute. On the previous engine I used a Cat 1R-1808 "high efficiency" filter with no issues. The 1808 crosses to a Donaldson P551808 21u absolute. What I'm getting at is that I would like to use the Donaldson DBL7505 15u absolute microglass filter but was advised that it could restrict oil flow and cause damage to the engine. I would like to stick with 10-w30 oil thinking that it will flow better through the 7505 than 15w-40. Will oil grade make much of a difference with this filter? There will be a warranty with this engine for four years and unlimited mileage but I'm hoping to keep it in good condition for longer than four years which is why I'm interested in a lower micron filter. Also I will let oil samples determine my oci, but will start at 10k miles and go from there. I don't plan to extend my oci by more than the Cat recommendation until the warranty is expired but I do plan to install a bypass oil filter setup before that.