Quote:
Originally Posted by afterburn 549
I dont understand.
We have all striven and strived for low-tension rings.
They are low tension under coast (not compression stroke) But under compression, they seal up tight.
I have seen this using my leak-down machinery. Less then 2% leak down in the Harley with about 12 lbs of tension and it uses no oil.
Yes, it is dry sump and perhaps helps?
I think the crap oil is the culprit to get the 1 % more mileage in these cars.
Reading various oil charts , there is no reason for the Ow20 stuff under normal operating temps .
(Unless one is living in a really cold climate)
https://drivenracingoil.com/c-1389539-shop-by-viscosity.html
Our Supra comes with the recommended 0W20 crap
It got dumped and replaced with 5W 30 at the 7K mark and I think that was way too late! But I was not at all sure if they had a break in oil in there somewhere too?
If it is low tension rings fault, then the oil is being consumed in the exhaust and intake stroke?
As of right now I cant understand that. |
this is a ridiculous strategy.
oil viscosity is specified by the factory based on the clearances, and as machine tools have gotten better, the rings, bores etc, all have gotten better, allowing for lower viscosity oil. just putting thicker oil in than designed will actually increase engine wear, not reduce it.
putting in thicker oil is almost always a bad idea. thicker oil means more pumping stress, means higher oil temps, means thinner oil, meaning you didnt actually get more viscosity, you just a stressing your oil pump more. for no reason.
the best oil rating is always (lowest you can buy)W(whatever the factory recommends).
ie, if the factory recommends 5w30, then then best oil you can buy for your car is 0w30. if the factory recommends 0w20, then you should put 0w20 in. this is because you always want thinner oil at start up, and then you want factory rated viscosity at temperature.
race motors included ... if you think your oil is thinning out at high track temps, then you need an oil cooler, not a thicker oil. lowestWwhatever the factory recommends.