here's my question,
from Molakule's post on the Engineer's Edge Educational site, it states fluid film thickness varies inversely with the load- when the load increases the film thickness decreases, so to what horsepower/torque rating is a 5w-20 engine oil good for, at temperatures of 200F, 240F and 280F ?
Ford wants to make 5w20 backward compatible with their whole fleet. What about marine engines? I have a 1993 351w motor, rated 285hp, in the boat. I've run synthetic 5w30 in it in the fall, would 5w20 hold up in that, why or why not?
"Ford recommends those who can't find 5w20 to use 5w30 but to switch back to 5w20 the next oil change."
What do all the people who said you can't use 30 wt in an engine calling for 5w20 or it'll damage the engine say now ?
from Molakule's post on the Engineer's Edge Educational site, it states fluid film thickness varies inversely with the load- when the load increases the film thickness decreases, so to what horsepower/torque rating is a 5w-20 engine oil good for, at temperatures of 200F, 240F and 280F ?
Ford wants to make 5w20 backward compatible with their whole fleet. What about marine engines? I have a 1993 351w motor, rated 285hp, in the boat. I've run synthetic 5w30 in it in the fall, would 5w20 hold up in that, why or why not?
"Ford recommends those who can't find 5w20 to use 5w30 but to switch back to 5w20 the next oil change."
What do all the people who said you can't use 30 wt in an engine calling for 5w20 or it'll damage the engine say now ?