fastcar123 Posted January 23, 2019 Share Posted January 23, 2019 What is everyone's opinions on these? I've read that GDI engines should use one. I believe our engines are GDI engines. I want the car to last as long as possible and have the same performance for as long possible too Link to comment Share on other sites More sharing options...
Notorious Posted January 23, 2019 Share Posted January 23, 2019 If you aren’t frequently pushing your car to its limits, increasing power significantly, or tracking it then there’s really no need. A properly functioning PCV system works fine. Link to comment Share on other sites More sharing options...
ammcinnis Posted January 23, 2019 Share Posted January 23, 2019 What is everyone's opinions on these? Another solution in search of a problem. Save your money. "If you don't know where you're going, any road will take you there." ~ The Cheshire Cat (Alice in Wonderland) Link to comment Share on other sites More sharing options...
mehmed_ii Posted January 23, 2019 Share Posted January 23, 2019 What is everyone's opinions on these? I've read that GDI engines should use one. I believe our engines are GDI engines. I want the car to last as long as possible and have the same performance for as long possible too No, neither the 2.5 nor the 3.6 are direct injection engines, they are both port injected traditional engines. Please leave it alone. Although the next generation of Legacy and Outback’s are most likely to get the 2.5 engine from the 2019 Forester which has GDI. Link to comment Share on other sites More sharing options...
paroxysym Posted January 23, 2019 Share Posted January 23, 2019 i think youre just asking for more issues... i dont think these engines require one Link to comment Share on other sites More sharing options...
ncted Posted January 23, 2019 Share Posted January 23, 2019 What is everyone's opinions on these? I've read that GDI engines should use one. I believe our engines are GDI engines. I want the car to last as long as possible and have the same performance for as long possible too As mehmed_ii correctly pointed out, the FB25 is not a GDI engine in the Legacy. That said, the effectiveness of oil catch cans is limited based on the tests I've seen. They work better on some engines than others as well. The best evidence I've seen suggests changing your oil more often and using top tier gas are the best ways to combat intake valve carbon build-up, and neither of those will entirely prevent it, just delay the effects. The only way to prevent it is to somehow clean the intake valves routinely. Toyota and others do this by using both Direct and Port FI in their engine designs. Not sure why everyone doesn't do this TBH. Link to comment Share on other sites More sharing options...
mehmed_ii Posted January 24, 2019 Share Posted January 24, 2019 As mehmed_ii correctly pointed out, the FB25 is not a GDI engine in the Legacy. That said, the effectiveness of oil catch cans is limited based on the tests I've seen. They work better on some engines than others as well. The best evidence I've seen suggests changing your oil more often and using top tier gas are the best ways to combat intake valve carbon build-up, and neither of those will entirely prevent it, just delay the effects. The only way to prevent it is to somehow clean the intake valves routinely. Toyota and others do this by using both Direct and Port FI in their engine designs. Not sure why everyone doesn't do this TBH. The main reasons for this are somethings that I do not agree with. Some engineers think that more injectors (twice as much) means more moving part, aka more things that can break. VTEC had the same concerns at first due to their extra moving parts, than they proved to be one of the most reliable engines out there. Plus I think having to walnut blast your direct injected car every 60k makes your car far less reliable than a dual injected car. -edit: Oh and higher manufacturing costs plus higher maintanence cost, which again, I disagree with since Toyota can do it on their cheaper cars. Link to comment Share on other sites More sharing options...
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