A toughguard is rated for 15k miles. 5k miles is a walk in the park. An Extraguard at 95% efficiency will do fine also and the difference in efficiency will have no effect on longevity. Changing the oil at the right time will have the biggest benefit.If both filter at 99% at 20u - then should the Fram Tough Guard be all you need to safely run for 5K mile / 6 month OCI's and have an engine last 300K miles with SP / GF-6 rated synthetic oils from WM ?
No one can answer that with one iota of certainty. Even if you got Fram engineers and engineers from the folks who make WM's oil together, their answer would be "probably".then should the Fram Tough Guard be all you need to safely run for 5K mile / 6 month OCI's and have an engine last 300K miles with SP / GF-6 rated synthetic oils from WM ?
Yes.I do stop n go traffic,average oil change every 6 months,3-3,800 miles.always cut open oil filters,and flush old oil out with cheap new oil.filter medias are always black,used. Used them all. The oil didn't burn off the contaminants at my intervals,so the filter media is used up sooner .the 15,000 mile thing,is if your driving highway and in non stop go traffic.If both filter at 99% at 20u - then should the Fram Tough Guard be all you need to safely run for 5K mile / 6 month OCI's and have an engine last 300K miles with SP / GF-6 rated synthetic oils from WM ?
*What about running a Tough Guard or Ultra for two consecutive 4K ~ 5K mile OCI's in a GDI engine - the filter should be able to handle this correct ?You've not stated what vehicle and what conditions the filter would be operated in, so we're all going to have to accept that this is theory and not specific. We can make generalized statements, but there's always some clown who's gonna say " ... yabut whut about a monster sludge engine run in Alberta in sub-freezing temps with 20w-50 and no block heater on a cold start when trying to get away from a hungry polar bear ...."
I'm going to constrain my advice to "normal" stuff and not absurd conditions. Both the TG and the Ultra are overkill in this situation and a waste of money. The EG will handle this situation with no problems whatsoever, even though the claimed efficiency is only 95%. I've run EGs for 10k miles many times and when cut apart, they are fine.
Efficiency is important, but only to a point. The small difference between 99% and 95% in 5k mile OCIs is essentially moot; your engine wear isn't THAT sensitive to a claimed number which probably varies in truth, depending upon which Fram filter model you'd choose in the first place. Secondly, capaity is important, but at 5k mile OCIs on a decent clean running engine, there's not going to be any concern for overloading the media.
Given a "normal" situation and 5k mile OCI ...
- an EG is already overkill for your true need, rated at 10k miles
- TGs are moreso over-capacitized, being rated at 15k miles
- XGs are the creme de le creme of waste, at 20k miles
Why pay for capacity you'll NEVER use, and efficiency ratings that will NEVER manifest into tangible wear differences?