Lars, don't worry about Merkava -- he's a quick oil change fanatic.
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The difference i have seen between europen and Usa is that europe has minimum A3 and you in Usa has for example A1. … … So europeans think thicker is better.
The big difference between European motor oils and here in NA (North America --Canada/US) is in conventional oils. In Europe, they still use Group I base oils in almost all their conventional motor oils. There is either none or virtually no Group II production in Europe.
Here in North America (Canada/US) we have switched to hydrocracked Group II base oils for almost all our conventional motor oils (5W-20, 5w30, and 10w30).
Some of the higher 10W-40, 15w40 and 20W-50 weight PCMO's still use Group I base oils, but they aren’t recommended weights for any new cars (gas) for many years.
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So europeans think thicker is better.
The reason they use thicker motor oils in Europe (particularly the conventional oils) is that Group I base oils in the thinner weights cannot meet the latest specifications (ie. … blending a 5W with Group I). If you go to Elf's international site, they don’t even list a conventional oil lower than a 15W (15W-40). Blending a 5w30 or even a 10w30 with Group I doesn't leave you with a very good motor oil (high NOACK and not very good oxidative stability). So, they blend the heavier viscosity oils to try and make the Group I based motor oils as robust as possible … 15w40's, 20W-50's …etc.
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I have personally installed two European imported Volkswagen diesel engines into cars here in the USA. Both engines were removed from wrecked, modern, maintained cars.
Removal of the oil pan on both engines showed excessive carbon and sludge build-up in the belly of the pan.
A good chance this is from Group I based oils that were run for fairly long intervals -- which they do in Europe compared to our shorter OCI's here in NA (even though our conventional oils here are far superior to those in Europe). Motor oils are very expensive in Europe compared to NA.
Lars, … I think if you are running a synthetic, then 12 - 15K kilometers is not out of the question.