I agree with all that's posted if you assemble it all together: viscosity per climate, consider additives, in England Castrol is your most likely choice for top quality, but synthetics are fine too. The caution on holding off using synthetic until after complete break-in is dead right, or your engine will be dead-dead not much later.
I like Lucas oil additive. Its like the old STP oil treatment. I also use Rotella T 10W30 by shell in the cuda. Its a heavier duty oil.
Personally I also take fish oil, 2 pills a day. Fish oil is an EFA (essential fatty acid) that increases your HDLs, the good lippo protiens that carry cholesterol out of your blood back into the liver. Its also a joint anti-inflammatory. Maybe putting a few pills in the old 318 would do it some good, eh??
