Hello all,
Got a 2014 ford F550 6.7 powerstroke. Been running 5w-40 synthetic (Valvoline and DELVAC). The Ford manual says for severe service run 5w-40. I wanted to get some opinions on 5w-40 vs. 15w-40? Keep in mind I am not looking to extend drain intervals...been changing every 5,000-6,000 miles or one year. It is a 35 foot Class C motorhome so it is always under load and going at highway speeds.
Question, does the 5w-40 lubricate, clean, and protect better than conventional 15w-40? Does the 5w-40 have better detergents, etc. than 15w-40? Or is the main difference the quality of base oils in the 5w-40 makes them last longer than 15w-40? Fresh oil (5w-40) vs. fresh oil (15w-40), is one better than the other at protecting the engine?
Thanks a lot.
Thanks.
Got a 2014 ford F550 6.7 powerstroke. Been running 5w-40 synthetic (Valvoline and DELVAC). The Ford manual says for severe service run 5w-40. I wanted to get some opinions on 5w-40 vs. 15w-40? Keep in mind I am not looking to extend drain intervals...been changing every 5,000-6,000 miles or one year. It is a 35 foot Class C motorhome so it is always under load and going at highway speeds.
Question, does the 5w-40 lubricate, clean, and protect better than conventional 15w-40? Does the 5w-40 have better detergents, etc. than 15w-40? Or is the main difference the quality of base oils in the 5w-40 makes them last longer than 15w-40? Fresh oil (5w-40) vs. fresh oil (15w-40), is one better than the other at protecting the engine?
Thanks a lot.
Thanks.