
I run Mobile 1 synthetic oil and use these to capitalize on the longer intervals between required oil changes. With these extended guard filters and 100% synthetic oils like M1 or the cheapest Amsoil 100% synthetics, I go 7000 miles (I could probably go more, but I'm conservative since oil is the lifeblood of an engine and aside from oil I don't do wonderful maintenance like I should).
The color of the oil IS dark, I agree, but the real measure would be to use a test kit on the oil to see if it is still protecting the engine. Color doesn't neccessarily mean everything. I would like to see 99% efficiency in an extended interval filter, but unfortunately to get that sort of protection you have to install a bypass and use two filters at once (one cheap and one 99% filter like K&N or purolator).
In short, Amazon has made it easy & inexpensive to avoid shopping around for hi- mileage filters of good quality. I'll keep buying these as long as Amazon keeps carrying them. The purolators are a good deal here also.
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Product Description:
Oil that lubricates and cools the engine is picked up by the engine's oil pump, cleaned by the oil filter, and reused. It is vital that any dirt or contamination picked up by the circulating oil be removed before it is pumped back into the engine.
Buy cheap Fram XG4967 Extended Guard Passenger Car Spin-On Oil Filter (Pack of 2) now
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