Why can a SAE40 be used hotter than a 15w40?
Wasn't it you who just cut off the usual arrows?
Why can a SAE40 be used hotter than a 15w40?
181 hp, thank you.Well thank God you saved your 180 HP car from blowing up from thin CAFE oil using only about 70% PAO base. Whew, that was close!!!
"Accommodating" for thicker or thinner oil could be as simple as larger or smaller holes in internal engine parts. I can see there being a difference in that. Somebody look up parts for a US and UK engine that facilitate oil flow and see if there's a difference.
Why can a SAE40 be used hotter than a 15w40?
I'm guessing maybe the mono grade (SAE40) is "tougher" per se than the multi grade and can take more of a beating under hot conditions.
??Wasn't it you who just cut off the usual arrows?
Sunny blue skies and calm waters.How's the weather out there on the lake?
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If it were no diff then why would they just not make them the same on hi end?40 celsius is 104 fahrenheit, 45 is 113. So are you really worried about this difference? It is just manufacturers best effort advice. If you are driving when it's over 104 change it to straight 40. When it is above 113 then must stop driving and pull over. The cooling system keeps the engine to 225 or whatever, it isn't going to be a problem.
Besides CAFE manufacturers have to compete with each other. If Toyota can beat Hyundai by one mpg, there are a lot of people who will go for the higher number even if it means nothing.
Oh? So a 40 is ok to use where a 60 should be used when the temps are that hot?
I thought they had limits.
Why can a SAE40 be used hotter than a 15w40?
You find that chart? On one website? And you claim it come from one article? Now that's funny.That chart doesn't appear to be from any owner's manual for a specific piece of equipment but rather comes from this article:
WHICH DIESEL ENGINE OIL SHOULD I USE? - TDX
TDX. World-class experience. Local know-how. We supply and service construction equipment from wheel loaders to diggers- New Zealand wide. We also supply generators, engines, transmissions, oil and filtration products.www.transdiesel.com
You find that chart? On one website? And you claim it come from one article? Now that's funny.
I found it on another site, and it can be found on 10,000+ other websites out there, it's a generic SAE oil-temp chart, etc.
Because of warranty requirements. Sure most passenger vehicle engines would run fine on 5w30. But if you use something not approved by the manufacturer, the warranty could be voided and claims denied. I think that is good reason for strong language and EMPHASIS.My guess is that you could use 5W-30 in practically 90% of passenger cars in the US. So why is there such an attitude of "USE WHATS IN YOUR OWNER'S MANUAL, OR ELSE!!!" and why is the language so strong in the US manuals?
Because of warranty requirements. Sure most passenger vehicle engines would run fine on 5w30. But if you use something not approved by the manufacturer, the warranty could be voided and claims denied. I think that is good reason for strong language and EMPHASIS.
VW tries their best to convince you of that as we discussed in another thread, but of course they end up saying that warranty will be denied if the oil you used caused the failure. No 504 00 oil in this application will cause engine failure, plain and simple. If anything it will help to prevent one.The owner's manuals "recommend", they don't "demand" that a specific oil viscosity is used. And I've never seen any owner's manual statement that says warranty would be denied if a different oil viscosity besides what was "recommended" was used.