Recent content by JustPlainFolks

What made me think about the new CK-4 standard vs. CJ-4 was what happened in the change from DEX-3 to DEX-6 in my Allison 1000 transmission. DEX-6 weakened some seals and caused leakage in transmissions built before 2006. I went with the TES-295 standard in the trans. I was wondering about a...

Does anyone have any info on Chevron's soon to be released CK-4 motor oil? How will it do in my 2003 Duramax? Will it replace CJ-4?