6-8 months? Unless your garage is a growing place for mold and mildew and is a tropical area NO PROBLEM !!! I have used filters 6 years old!!
In regards to FRAM, I most certainly understand that a lot of people dis them and avoid them like the plague. However, I have run a 1987 TLC with 15,000 mile oil changes and Mobil One 5w30 oil for app 250,000 miles,and 14 years and YOU guessed it FRAM PH8A oil filters, at the time 2 for 4., then 2 for 5. and now 2 for 6. So we are talking between 17-19 oil filters. I did however change oil a bit sooner when it was new and breaking in. (1000 miles oil and filter change)
Since there is a requirement for 15,000 mile valve adjustments, it has been opened by Toyota dealer mechanics app 16-17 times. Every time the mechanics have remarked at how clean the innards are and how it is almost like new specifications.
I really think the only thing folks have really succeeded in doing is to illustrate the manufacturing quality or lack of it. I CERTAINLY WOULD NOT FAULT anyone, for buying on real and or perceived quality or lack of it!! The question I ask myself however: does a 10 dollar filter perform 5x better than a 2 dollar filter??
From a filtering performance point of view, NO statistical CASE has been made that a so called "better" constructed filter AND incidently better filtering in a longitudinal statistically significant case such as 250,000 miles, filters measurably better in terms of engine wear and or compression etc. Let alone "does a 10 dollar filter perform 5x better than a 2 dollar filter??" The other problem is indeed simple economics. Any oil filter manufacturer, do you think they want you to buy more or LESS of their products
? The other side of this coin is even with overwhelming proof that bypass oil filter systems and preoilers can work in tandem to cut the majority of 58-80% of the wear that is due to the so called "dry start up" and the other 50-60% (of the remaining 42%-20%) of the wear due to being able to filter out the much smaller particle size, VERY few people and %'s buy either or and/or both of them!
Incidently, even on this august board, no one has done an A/B test between filters to see if it makes a real difference in wear elements on an engine. They have certainly done it for oil, i.e.,
http://neptune.spacebears.com/index.html
[ January 09, 2005, 10:12 PM: Message edited by: ruking77 ]