Oil 5000 miles +

[Kal-El]

Originally Posted by PetersRedYaris

I agree, but that's the US oil change interval... I find it very interesting that the European Yari have longer intervals, like Andies 9,000 mile (15,000 Km) recommended change from post #18. His TS has the same motor as the new Corolla, so whats the difference?

You have to question why US yari have shorter recommended oil changes compared to the rest of the world.

Yes, I'm quite curious to know why the intervals are different.

[TheSilkySmooth]

Originally Posted by Kal-El

Yes, I'm quite curious to know why the intervals are different.

One thing, longlife synthetic meets a chem-E definition of 'synthetic' in the EU, so you have grp iv-v blends over there that have MUCH lower residue over a 15km interval where a "big USA Name oil" SM/SL would be 'toast'. rest assured though, Your Redlines and some Amsoils would compare favourably to the energy conserving EU oils. The Eu ACEA spec can be manufacturer specific, and A3/B3 is very conservative for HTHS viscosity;BMW lost a whole bunch of engines running underspec USA oils over here and spec only ONE Castrol very high weight oil. But Dont worry, EU typical citizen microcar EU manufacturers and producers will soon be following API/ISLAC for lower emissions and their engineer will be pulling hair. See the ACEA A1/B1. In fact we are running a French Motul 8100 that meets SL and a1/b1 and I can say its not too great, so they are already in the dumpster on changes. It will take time and a lot of engine failures before this gets settled. I bet in 2-3 years you will see something in news about bad oils if a new "wonder chemical additive" doesnt come out to replace the "banned' Zinc phosphates (zddp). I need to studythis big advance that Castrol is touting. - Papa

[TheSilkySmooth]

I am curious to know if the EU spec vehicles and those sold in NZ and Australia have differing piston and journal clearances to utilise the more viscous oils for long life intervals. You can't specify 5w-20 and 15W-40 in the same engine regardless of ambient temps. The engine temp is mainly determioned by the coolant thermostat.