I wasn't sure if that Ford was part of the company or just happened to be a nephews personal truck but with that type of miles accumulated means its been on the road some and hard to say where the idling hours are at. That seemed to be one of the issues or at least before that TSB/recall Ford put out about updating software that in some cases increased idle speed but also from my understanding programmed the variable vane oil pump system to supply more oil at lower engine/idle speeds. Engines are not happy with lack of oil lubricating the parts apparently !. And also who's to say that due to ( making the assumption ) that Amsoil was being used and that it may have helped prolong the engines valve train life further out.
2011 GMC, 5.3, 183k miles. OK, ....I don't know, this may open a bucket of discussionworms. Ha. Here's the issue. I've been following GM's "mandate" to use Dexos 1 oil, 5w30 (Castrol). I'm thinking maybe I should consider a High Mileage oil due to 183k miles. Castrol and Mobil 1 both make HM but both do not display the Dexos 1 label. So....since I'm way past warranty does it hurt anything at all to change to the HM oil? Its not "Dexos 1" but I kinda doubt it will hurt a thing. I'd like some input especially if someone has done this. Thanks
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