mark
+1y
mine was just rebuilt, so im still usin regular mobil 5w-30......after bout 10k, ill switch it back to mobil synthetic 5w-30, 10w-40 in the summer when it gets hotter
me and my dad has always used mobil synthetic, his mazda was put on it at 90k has like 190k on it now, runs strong, no knock, compression is at like 155-160 last time i checked
i use synthetic on my ranger too