Originally Posted By: tdi-rick
Originally Posted By: phlfly
I think you are wrong first able in Europe all in km so 20,000 is about 12,000 miles which is most German manufacture recommended to do between 10,000 to 15,000 miles.
Also people don't drive so much miles/km per as US. The traffic is lighter so less time sitting at idle and weather is much cooler and less humidity avg then US. So the oil properties last longer.
Just as example VW TDi recommend to every 10,000 miles but after oil analysis was done TBN was 0. So oil didn't survived 10,000 miles maybe due oil maybe diesel fuel maybe it all drives by environmentals to safe a planet by in the end it cost to us.
Ever been to southern Europe ?
There are countries there called Spain, Portugal, southern Italy, Greece where it's at least as hot in Summer as the southern US states.
Or how about all the Euro cars that are sold all around the world and spec the same service schedules (when ULSD is available) such as here in Australia ?
ULSD needs to be Having said that I regularly took a Japanese IDI TD engine past 20,000km easily ten years ago and we were only beginning to transition to 50ppm sulphur diesel from 500ppm sulphur diesel.
TBN and wear metals were fine but sulphated ash levels were significantly higher too. Swings and merry-go-rounds really.
Trucks can go 100,000km between OCI's and have been doing that for well over a decade with premium syn HDEO's, and it's still normal practice with low SAPS oils.
Yes, they have huge sumps and with 'normal' oil consumption additive levels are topped off with makeup oil, but still.....
Unless the majority of trips of are less than 15-20km or the majority of run time time is spent idling, 3000mile/5000km OCI's are a waste.
All list of countries is nothing even close to weather in US during summer most state from NY to Florida and all cross and down to south expect pacific state ( cal, Oregon, was) the temp is 90F + add to 50 to 90 % humidity so feels like 100+ F . It's continue from end May to mid October.
Also I don't suggest OCI w should 3,000 miles I would say if its 100% synthetic then 5,000 to 7,000 miles most. Also you need look oil capacity at each individual car maker, like BMW has about 8 qt on each model, but Japanies is about only 5 qt so I don't think oil will have same good result between those cars after same time in the service.