5W-50 on the streets isn't going to hurt that engine in any way ... but it's not really going to be needed for that engine on the street IMO, 5W-30 should be plenty. When Ford speced 5W-20, most Mustang owners just bumped up to 5W-30 on their own.Sorry, I think you misunderstood my question. I asked how not why? In what way might an engine suffer? How would a heavier oil harm an engine, and in particular, this engine?
That makes zero technical sense whatsoever. Can you explain how this dealership determined the winter rating of the oil? And just how many warranty denials are we talking about here? A warranty denial would have to be because the oil caused a failure. This will not happen because of a different winter rating.Ford in the past has been a stickler on recommended oil viscosity adherence. I remember them not honoring warranty for main bearings when people used 10-w30 instead of 5-w30. This was the 4.6 engine.
Is it going to harm the engine? What are you saying here?anything but motorcraft 5w50 lol
My 2017 Accord Sport says 0W20 on the oil cap, I have M1 0W40 in it. It’s just my daily driver/commuter car. Usually have the cruise set at 65mph in the right hand lane.Engine was designed to run on a 20 or 30 weight. If you’re just daily driving the car, why would you want a 50 weight in the sump? Now if it was seeing a lot of track time, high rpm’s, higher oil temps, I’d see more reason of course.
The old “tolerances” thing. The use of that term shows that the person doesn’t know what they are talking about but only repeating something they have heard or read on the Internet.
There is no explaination except the only way a 10W could cause damage when a 5W wouldn't, was if the start-up was so cold that the 10W lost its pumpability, when a 5W would still pump.That makes zero technical sense whatsoever. Can you explain how this dealership determined the winter rating of the oil? And just how many warranty denials are we talking about here? A warranty denial would have to be because the oil caused a failure. This will not happen because of a different winter rating.
Where does it read the engine was made for 5W-30?
Tolerances are the allowed variations of the blue print specified clearances, We can tell who actually knows things posted here.The old “tolerances” thing. The use of that term shows that the person doesn’t know what they are talking about but only repeating something they have heard or read on the Internet.
I would if mine, probably run a euro 5/40. Now in hot summer maybe M1 15-50. But I tend to drive engines hard and run short OCI 5kA 5W-20 at room temp is still more viscous than 5W-50 at operating temp. So, as already mentioned, engines aren't designed around viscosity. Viscosity is determined by ambient temps and intended usage. I vote for M1 FS 0W-40 across all duty cycles, unless the engine just lives at the track 60%+ of the time, in which case 5W-50 does make sense.
I've been away from the site for a year or two... I see nothing has changed..
Until everyone drives an EV.The arguing about oil and what weight oil to use does continue.