Recent content by oldmerc

I hardly drive in winter in Midwest (mostly summer driving). so 15w40 would be good I did not want to go full synthetic as I did not want to introduce leaks, hence I was going with T5 blend. However, I might go full synthetic since I have a small oil leak anyways. (it can't be worse, can it...

Thanks for the explanation when you say Euro 5w40 you mean something like this: https://mag1.com/products/passenger-car-motor-oil/full-synthetic-european-motor-oil/mag-1-full-synthetic-european-5w-40-a3b4-motor-oil/ I am guessing these will still be API SN and would have less than 1000 ppm...

That makes sense.. so from your explanation then if you see DUAL for 40 grade, then you would assume that it has enough phosphorous/zinc . if you see dual with SP, stay away for flat tappet? Another question, I am still confused about whether I should keep using diesel oil for my flat tappet...

Do the CK4 only diesel oils are more lenient in terms of phosphorous/zinc compared to the ones that also have SN? I do not understand how the ones that have SN approval are allowed to have such high numbers.. can someone please explain? Ex: Rotella oil recently had SN on the label. does that...