I`m quite partial to the Chevron Delo 400 15W-40 if you really want to use a 15W-40. I used it in my 93 Ford Ranger 4X4 4 liter for about a year, with good results. The vehicle now has 145,000 + miles. However I have recently went to 5W-30 S3000 Amsoil, as I decided I didn`t need a 15W-40. I don`t have any clatter issues though. I don`t notice any engine sound difference after switching. The engine does idle a little higher, and seems a little peppier. It used almost no oil before, and uses almost none now.
I`ve never done a UOA on this truck, and have the kit when I get 7,500 miles.
quote: Originally posted by Back40: Considering switching from 10w30 GTX to 15w40 for summer to lower consumption and lessen the engine clatter in my 92 Toy 3.0 V6 4x4 xtra cab. Any feedback is appreciated on suggested brands.