Originally Posted by
gumus89
Reading the crap about cars not starting when using thicker oil, I gotta say, you guys dont know what those numbers means if you say its waaaaay too thick.
The only relevant number at start up is the 15W. Compare that to the 10W of FEO and its not a very large difference. This number is the oils thickness at something like -18 celsius. So is more indicative of the oils thickness at start up.
Ill admit that the operating temperature thickness of 60 is a bit excessive and if you had vtec, it might make it difficult to make the switch from low to hi cam.
Essentially, for best protection against wear, you would use the thinnest oil you can at start-up and the right thickness to maintain the right oil pressure at operating temperature. Yeah, you might leak some thin oil when your engine is cold, but the can circulates the thin oil a lot easier, meaning you get coverage sooner than for a thicker oil.