Originally Posted By: Gokhan
5W-30 will be a lot thinner than 5W-40 with a cold engine; therefore, it will offer better protection with a cold engine.
Claims such as this should be quantifiable...there's a pile of prematurely worn engines as you enter Europe that you can surely point to...
Oil will be flowing in seconds in either, how can there be a material difference in "cold" protection, at any normal 5W climate...how does the API get it so wrong ?
Originally Posted By: Gokhan
Moreover, 5W-40 will put unnecessary strain on your oil pump at all temperatures.
Similarly scare mongering claptrap...failed oil pumps and driveshafts...where
Originally Posted By: Gokhan
Fully synthetic 5W-30 SN / Resource Conserving / GF-5 is the correct oil for your car and you will also save up to 5% in fuel costs.
OK, demonstrate the basis for your 5%GF-5 doesn't claim that, the test requirements aren't anywhere near that, particularly after 100 hours, where are you getting justification for 5% ?
Originally Posted By: Gokhan
Your engine will probably last longer, too.
Give us an explaination on how this could be...5W either will be flowing within a second or so in either case.