Posted by tom in boise on Wednesday, December 11, 2002 at 10:16AM :
OK, I made the plunge and converted to Mobil 1 10W-30 this weekend. I did a "flushing oil & filter change" using NAPA 10W-30 and then went ahead and changed the filter and oil again to the Mobil 1. To refresh, this is a 98 Dodge Ram 2500 V-10 4X4 with 78000 miles on it.
Anyway, so far the only difference I have noted is a greater flucuation range in oil pressure from idle to road speed (in other words, the oil pressure drops lower when at idle, then when using conventional 10W-30 oil). I should mention the oil pressure at idle is something like 40-45 psi now, and before was around 55 psi, as interpolated on the factory gage.)
I will post again if anything else happens.
Tom
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