Hi, me again. This is an oil I recently tried in my Pontiac 400. According to Mobil, the 15w50(silver cap) has a higher amount of zinc additives for high spring pressures and flat tappet cams. As far as seat of the pants performance, this is the best oil I have ever used. The car is very responsive compared to the other coventional 15w40's and 20w50's I've tried.
One thing I noticed with it was I had more valvetrain noise.
I read on the Crane cams sight(my cam is a comp cam xe274) that they do not recommend synthetic oil even after break in. They claim that synthetic is so slippery that it will not allow the lifters to turn properly. They also claim that the synthetic will fall off the cam. Any truth to this? Will I screw up my cam If I use this oil? Mobil, of course, said I won't. Is it normal to have more valvetrain noise with mobil 1?
One thing I noticed with it was I had more valvetrain noise.
I read on the Crane cams sight(my cam is a comp cam xe274) that they do not recommend synthetic oil even after break in. They claim that synthetic is so slippery that it will not allow the lifters to turn properly. They also claim that the synthetic will fall off the cam. Any truth to this? Will I screw up my cam If I use this oil? Mobil, of course, said I won't. Is it normal to have more valvetrain noise with mobil 1?