I have a 2000 4Runner with 210K on it. I've been running semi-synth all it's life. Can I go back to conventional now? Is conventional just as good in protecting the engine and maintaining performance as long as I change it more often?
Thanks
Joe
Synthetic blend or semi synthetic is the “new” conventional option now. I Castrol GTX ultra clean in my 15 F150 and change @ 4K mi. There’s really not a lot of difference between the 2 because companies are not required to say the percentage of synthetic is mixed in. The only rule they have to follow is there has to be at least 1% synthetic mixed in. So who’s to say you haven’t been using conventional the whole time? I personally wouldn’t change a thing and keep running it because of how cheap blends are.
