I have an Infiniti m35 which I use 0w40 in. But I have a valve cover leak which I will probably tackle later on because I have to replace the whole valve covers anyways (non replaceable sparkplug boot seals)
But question is are high mileage oils bad? I know they condition and swell up seals but always wondered if they would ruin seals in long run and swell seals that are not in need of conditioning ect...
Should I consider high mileage oil at 135k? Continue 0w40 or 5w30? To minimize burning oil smell from VC gaskets
But question is are high mileage oils bad? I know they condition and swell up seals but always wondered if they would ruin seals in long run and swell seals that are not in need of conditioning ect...
Should I consider high mileage oil at 135k? Continue 0w40 or 5w30? To minimize burning oil smell from VC gaskets