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Reply to "API CF"

@:Roger

I was more aiming on the fact that older engines which require API: CC or even lower can have problems with sealings/gaskets when using a pretty doped oil like CI-4.
Sometimes an OEM limits the quality of the oil in its recommendation.
For example the Nissan Terrano II from 2002, diesel, is limited to CF-4 as a maximum, which means you may not use a CH-4 or CI-4. I'm not 100% sure if this is to prevent glazing, I have to dive into some archives and get back on it...
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