Originally Posted By: crazyoildude
5w20 seems to work very well in some of the overhead cam modular engines also 5w20 flows better than 5w30 and cools the engine better especially the bearings which are pretty wide and like the thinner stuff as a general rule. We had a 5.4 modular engine here in november with 45,000 or so miles on it and it needed new bearings and we had to cut the crank because the owner used 10w40 in the winter and 20w50 in the summer. Usually when we get a 4.6 or 5.4 ford modular engine for rebuild they have over 175,000 miles and some over 300,000 miles unless of course they overheated or have run with no oil
I have heard this same scenario twice from people I know. One guy had a 5.4 [censored] out at 21,000 from running 10w30 in the Winter. Bearings were gone as well.
5w20 seems to work very well in some of the overhead cam modular engines also 5w20 flows better than 5w30 and cools the engine better especially the bearings which are pretty wide and like the thinner stuff as a general rule. We had a 5.4 modular engine here in november with 45,000 or so miles on it and it needed new bearings and we had to cut the crank because the owner used 10w40 in the winter and 20w50 in the summer. Usually when we get a 4.6 or 5.4 ford modular engine for rebuild they have over 175,000 miles and some over 300,000 miles unless of course they overheated or have run with no oil
I have heard this same scenario twice from people I know. One guy had a 5.4 [censored] out at 21,000 from running 10w30 in the Winter. Bearings were gone as well.