why the need for a 0w40 in a car spec'ed for 0w20?Instead of Mobil 1 FS 0W-40, I would give Mobil 1 ESP X4 0W-40 a try. Autozone carries it, and you can get it at a good price if you get some oil filters.
I was offering it as a better alternative to M1 FS 0W-40, not saying he should run it in a vehicle calling for 0W-20.why the need for a 0w40 in a car spec'ed for 0w20?
The M1 ESP 0w30 with a hths of 3.5 that was mentioned earlier seems fully sufficient.
What's your basis for stating that it's better than the FS oil?I was offering it as a better alternative to M1 FS 0W-40, not saying he should run it in a vehicle calling for 0W-20.
I realize that but it still shows that there is a difference in oil temperature between a cold day and a hot day. That difference is enough that with the cooler oil temperature it would basically have the same effect as having a 40wt in there (especially since I run ESP 5w30 which is almost a 40 anyway).Those are not extreme numbers by any means. That means the cooling system is doing what it was designed to do. 205f oil temperature is peanuts.
how would you see this without removing the piston?to see if one of my favorite oils will keep pistons clean!
Best I can do is to see if my oil consumption returns.how would you see this without removing the piston?
I would say the increase or decrease in temperature depends a lot on cooling system and the way it is design. In BMW changes are minimal.I realize that but it still shows that there is a difference in oil temperature between a cold day and a hot day. That difference is enough that with the cooler oil temperature it would basically have the same effect as having a 40wt in there (especially since I run ESP 5w30 which is almost a 40 anyway).
The engines are designed to run a range of grades. The engines that are designed to run a thinner viscosity have closer tolerances in the engine, Bearings, Pistons etc. Going up a grade is probably fine but 2 or 3 grades may be a bad idea in cold weather especially. Unless your running it hard. Watch some of Lake speeds videos and you will see why. Costs horsepower, Torque and more.why the need for a 0w40 in a car spec'ed for 0w20?
The M1 ESP 0w30 with a hths of 3.5 that was mentioned earlier seems fully sufficient.
Can you give some modern from a manufacturer examples of this?The engines are designed to run a range of grades. The engines that are designed to run a thinner viscosity have closer tolerances in the engine, Bearings, Pistons etc.
No they do not have "closer tolerances". Did you learn this on YouTube as well?The engines are designed to run a range of grades. The engines that are designed to run a thinner viscosity have closer tolerances in the engine, Bearings, Pistons etc. Going up a grade is probably fine but 2 or 3 grades may be a bad idea in cold weather especially. Unless your running it hard. Watch some of Lake speeds videos and you will see why. Costs horsepower, Torque and more.
Uh, no.The engines are designed to run a range of grades. The engines that are designed to run a thinner viscosity have closer tolerances in the engine, Bearings, Pistons etc. Going up a grade is probably fine but 2 or 3 grades may be a bad idea in cold weather especially. Unless your running it hard. Watch some of Lake speeds videos and you will see why. Costs horsepower, Torque and more.
No, mass produced automotive engines generally all have pretty similar clearances, regardless of grade spec'd (clearances are the spaces between parts, tolerances are the allowed amount of variation from the spec'd clearance). Where things change is when we get down to grades like 0W-12 and 0W-8 where the MOFT just isn't there with these ultra thin oils, so the solution is to increase the bearing width, to increase its load carrying capacity and provide a larger film over which the load is spread. This increases friction of course, but apparently the increase in friction here is less than the overall savings by going with the thinner oil when looked at as a whole. This was heavily experimented with in Japan long before it made its way to North America.The engines are designed to run a range of grades. The engines that are designed to run a thinner viscosity have closer tolerances in the engine, Bearings, Pistons etc. Going up a grade is probably fine but 2 or 3 grades may be a bad idea in cold weather especially. Unless your running it hard. Watch some of Lake speeds videos and you will see why. Costs horsepower, Torque and more.
Yes. I saw it on you tube. In an engine shop for Lake Speed @ total seal piston rings. Ill look for the video. I just did a general search on the internet. Here is what I found. It makes perfect sense to me. I had a ford 300 straight 6 that had worn mains and rod bearings. Oil light would come on at idle and going up 2 grades to a 20w50 bought me some time ( about a year). I understand every manufacturer has a tolerance and i dont know what it would be in this case study. Just that running a grade way outside the spec would not be my recommendation.
Aug 29, 2021 — The typical rule that most engine builders follow is that bearing clearance establishes the viscosity of the oil to use within a given oil temperature range.This is another interesting article on oil viscosity and bearing clearance. https://blog.k1technologies.com/bearing-clearance-and-oil-viscosity-explained
There are several interesting take-aways:
1) The typical rule that most engine builders follow is that bearing clearance establishes the viscosity of the oil to use within a given oil temperature range.
2) Generally, the tighter the bearing clearance, the lower the viscosity the engine can use while wider clearances require thicker oil.
3) A bearing’s load carrying capacity is directly affected by clearance. As the clearance is...
- OldCowboy
- Replies: 66
- Forum: Passenger Car Motor Oil (PCMO) - Gasoline Vehicles
https://www.enginelabs.com/news/what-i-learned-today-bearing-clearances-vs-oil-viscosities/
I think the Ford spec'd 10W-30 back in '85, but yes, the numbers are very close, in fact the lower limit on the Ford mains (0.0004) is slightly tighter than on the Toyota (0.00051).The clearance numbers are close. The ford recommends 5w30 in the 302 and the fa toyota takes 0w20. I suppose in this case one could use 0w20 in the ford for better mileage.
Edit I wouldent. recommend it... Who know what it would do to other things. Thanks for the info