my daughter's garage mechanic tells her that she doesn't have to change her oil filter with an oil change.Is this correct????
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2004 Mitsubishi Outlander Question: oil filter
Answer #1dandd September 25, 2009, 15:55Master
This is NOT correct. The oil filter collects the debris from the dirty and degrading oil. It also collects the very small metallic particles from the engine wearing. I have personally seen engine oil filters burst open, which causes the engine to lose all of its oil, which results in a ruined engine when the person goes too long without an oil and filter change. I have also seen VW and Audi increase the size of their filters, recently as in with in the last 5 years, because their filters were not gathering enough of dirt and contaminates which led to premature engine failures. Need I say more??
Answer #2certified.ase.tech September 25, 2009, 16:22Journeyman
your mechanic might not have had the filter in stock & figured it would be ok. usually the only cars you don't change the filter every time are performance cars that get the oil changed very frequently.
Answer #3dcg129 June 21, 2011, 09:36Enthusiast
Your all right, it depends on risk assessment. 1. Cheap filters are no good period. 2, Quality synthetic oil is much better and lasts longer. Today's engines and fuel are much cleaner and don't develop the sludge problems as quickly, Before 1940 cars didn't have oil filters, in the 50's and 60's mechanics always changed the filter the second oil change with single weight oil. Now with better filters and multi-weight oils. you can go 5K - 10K per oil change. Tests prove there is no difference in engine repair when you change oil 3K or 5 K, but Turbo oil s/b changed every 5k IMHO. I have tested my oils at 3K, 5K, 7 K, 9K and 11K all synthetic oil tests came back fine. Research shows around 12K to 14K Synthetic oil loses its fuel saving qualities. I opened my filters too at the same time, all were fine. the one at 9K should have needed changing in 2-3K. Filters work better when they have some usage (dirt contaminants) in them. For me, I have a turbo and I change my Syn. oil every 5K and filter every other oil change and I have never had an internal engine parts failure our cars average a total of 30K to 40K per year. MY Altima has been changed every 10K for 90K and no problems.
It is just as important to change your Tranny fluid.I drop half every 3rd oil change. All of my cars never had issues. I usually have cars 175 K to 225K and am paid well when someone plows into my rear end or parked car.
Older Toyotas had engine problems after owners were following the manual and changing oil every 7.5K because the owners were putting in 10w40 instead of 5w30 and driving all city roads7.5K was for highway and synthetic oil that was 5w30 not 10w40.