I've been intrigued for a little while about some of these heavy, huge viscosity spread oils.
I've used a lot of 20W-50(generally VR-1 or GTX), and as anyone knows it flows like molasses when cold. I know cold flow out of the bottle isn't a great measure, but it seems to me that, especially at lower cold start temperatures, it could take its time getting to where it needs to be. I've personally seen the oil pressure rise somewhat reluctantly in an engine with 20W-50 when it was say in the 30s, where it comes up almost immediately at warmer temperatures.
I'm aware of two 5W-50s on the market-Castrol Edge and Mobil 1. Both spec enough zinc that I'm not worried about them for flat tappets. I have a half case of Edge sitting here, and I'm kind of itching to dump it in my MG. Mine isn't a garage queen-I drive it as long as there's not salt on the roads-and still like to start and work on it even when there is. It seems like this oil would be a game changer.
For reference, this is a freshly rebuilt and consequently fairly "tight" engine(rebuild=teardown, bore cylinders, grind crank, put together with new bearings, pistons, rings, cam, etc) that I'd guess has about 800 miles on it. I'm due for a break-in oil change now that it's done some serious miles(the shop changed it after the initial 30 minute stationary break-in and then supposedly after driving it a bit) and am wondering about putting this in vs. just a good 20W-50.
Any thoughts on this? My biggest fear would be that it would be TOO thin at when cold.
I've used a lot of 20W-50(generally VR-1 or GTX), and as anyone knows it flows like molasses when cold. I know cold flow out of the bottle isn't a great measure, but it seems to me that, especially at lower cold start temperatures, it could take its time getting to where it needs to be. I've personally seen the oil pressure rise somewhat reluctantly in an engine with 20W-50 when it was say in the 30s, where it comes up almost immediately at warmer temperatures.
I'm aware of two 5W-50s on the market-Castrol Edge and Mobil 1. Both spec enough zinc that I'm not worried about them for flat tappets. I have a half case of Edge sitting here, and I'm kind of itching to dump it in my MG. Mine isn't a garage queen-I drive it as long as there's not salt on the roads-and still like to start and work on it even when there is. It seems like this oil would be a game changer.
For reference, this is a freshly rebuilt and consequently fairly "tight" engine(rebuild=teardown, bore cylinders, grind crank, put together with new bearings, pistons, rings, cam, etc) that I'd guess has about 800 miles on it. I'm due for a break-in oil change now that it's done some serious miles(the shop changed it after the initial 30 minute stationary break-in and then supposedly after driving it a bit) and am wondering about putting this in vs. just a good 20W-50.
Any thoughts on this? My biggest fear would be that it would be TOO thin at when cold.