AO Platinum Member
Join Date: Feb 2002
Location: The land that Time forgot
Aye! In theory, you would burn more of the 5W30.. It's thinner when it's cold and it's thinner when it's hot.
Whether you use semi or fully synthetic is academic to oil consumption. Your beast wants 5W.. or 10W40 grade and the "only" advantages of synthetic are that it stays in grade longer, acts more consistently when it's old and new.. has ultimately higher protection levels and contains more detergents to clean out the crud, gum and soot that oil has to absorb. It's "better" but that won't stop you burning it.
You can probably get away with 15W40 in the summer and that might help.. as it's a bit thicker than 10W40 when it's cold, so less will disappear to wherever it's disappearing to. You may be losing more oil when the engine is cold as any tolerances between moving parts are greater. When the engine warms up, everything fits more closely so your oil can't nip out.
The only thing with 15W40 is that you need to be a bit more careful when you start the engine up as it's thicker so will take more pumping .. it'll take longer to get to the top of the engine. The difference isn't tooo big but it's worth being aware of if the temperature is particularly low.
How many miles has the beast done? Most 15W40 is sold as "for higher mileage" engines... so you see where they're coming from (high miles = more slop).
But anyway.. my suggestion ... try 15W40 now that warmer weather's coming... but semi-synthetic. It'll be fine for up to 12,000 miles.. and it's not so expensive that it's a shame to bin it when you change the oil back to a 10W40 for next winter.
No bullets for Chaingun..