Quote:
Originally Posted by HypermilerAX
I already considered less viscous oil but I don't think the tiny gain will pay the higher cost of the oil.
|
It doesn't have to be much more expensive.
It is when you buy from the big brand names.
But you really don't need to do so ...
Dunno if you can read a bit German ?
14 Motoröle im Test: Wie gut ist Billig-Öl? - AUTO MOTOR UND SPORT
How good are cheap oils ...
Turns out most of the cheap stuff is just about as good as the expensive oil .
The reference in the test is Castrol oil to VW 507.00 spec.
Good stuff, but expensive @ 22 €/L
You can read the oil names
Urteil = test opinion or result
Empfehlenswert = recommended
Bedingt empfehlenswert = less recommended
Some manufacturers also state their products are OEM approved under a different name ... and with lots of companies being owned by the same mother company I'm not surprised about that.
BP own Castrol and Aral.
They've done high-low market split well before Renault - Dacia.
Similar applies to tyres, BTW , with high-end OEM wanting a share of the cheap market as well.
Dunno about buying oil in France, but the Germans have some web shops that sell oils at far lower prices than what we'd pay here in Belgium ...
Quote:
|
I think I can go as low as 5W40 but to see real improvements the second index should be lower as my oil temp is at operating temp 85% of the driving time. So changing from 15 to 5 will affect efficiency only during 15% of the driving time.
|
The advantage of the lower cold
weight oils, is that they lube better when cold - while the higher cold
weight oils are still too viscous to properly lube.
Back in the day when cars requiring say 15w40 were built, the low (cold) viscosity oils with weren't about or were very expensive and viscosity modifiers weren't nearly as sophisticated or effective.
I won't mind going for lower viscosity on the cold end with a modern oil, but I wouldn't go lower than the lowest spec the engine manufacturer prescribes on the hot end.
That's the weight of oil the manufacturer thinks his engine needs to keep it properly lubed. If the oil is too thin when warm, it won't properly lube anymore.
If PSA allowed .w30 weight in the 1.5D, I'd run it.
If they only allowed .w40 weight, I'd stick to that.
Quote:
Originally Posted by renault_megane_dci
Top notch oil is what took my Clio 1,9D from 700 kms tank to 800 kms tanks back in the days.
It also made the car much smoother.
|
What do you call "top notch oil" ?
Best quality, or some lower weight oil ?