Best break-in oil???
The situation is more critical with stiffer valve springs.
Do NOT use this:
The API rating of SN/SM/SL means that it is HIGH detergent. Despite the claim of having extra zinc, the detergent in the oil won't allow the zinc to stick to anything. High detergent oils might as well have NO zinc if it can't stay in place and protect things.
I've used this stuff:
There is nothing wrong with it but it is pricey. This is cheaper:
The situation is more critical with stiffer valve springs.
Do NOT use this:
The API rating of SN/SM/SL means that it is HIGH detergent. Despite the claim of having extra zinc, the detergent in the oil won't allow the zinc to stick to anything. High detergent oils might as well have NO zinc if it can't stay in place and protect things.
I've used this stuff:
There is nothing wrong with it but it is pricey. This is cheaper: