Thanks XTO, but that's quite an old article (2000). If anything and if I go back to dino, Delo 400 is still the one for me - my car came with gallons of it in the trunk still unopened. Magkano going rate ng Delo 400 dyan? Here I think it's $11-12 a gallon (3.78L).

Didn't notice any significant difference between Shell Rotella 15W-40, Chevron Delo 400 15W-40 and Mobil Delvac 15W-40 (I heard this Mobil Delvac has been reformulated, again, by Mobil). Tried out Valvoline Blue before, also 15W-40, not much significant change. When I went for Rotella synthetic, 5W-40, I noticed it starts easier but my better MPG could also be attributed to lower driving speeds. My friend who has a diesel in Alaska, swears by it though, that's what got me to try out Rotella 5W-40.

I want to try Lubro-Moly next, pero sobrang mahal at malayo sa amin yung nagbebenta. Hay...