As far as fuel mileage goes. I've read that ford did some testing with 5-20 and found out it makes less than 1% difference in controlled tests. All their new cars recommend the thinner stuff apparently for a marketing type thing, not so much any actual benifits. You can basicly dump in what you want, you probably won't notice much difference either way. You shouldn't really need to run really thick oils unless the thing is totally worn out and fouling plugs or something. Even then, thicker oil will only help so much.

Always use the recommended oil specs provided on your owner's manual.

Raul T.

Kia Social Team

Lets see. If the manual in the glove compartment calls for 5W-20 what's 10W-40 doing in the crankcase anyway? 20W-50 is out of the question. The car will never start in the Winter time.

*The thicker the oil the slower the oil pump forced lubricant to the frictional surfaced during start-up. Over 80% of all engine wear happens during cold starts!

Stay with 10W-40, although 5W-40 is acceptable. Oil viscosity is largely determined by bearing clearance. Oil clearance is .0005-.005 inches. 20W-50 would be used with bearings spec'd at .002-.005 inches; 5W-40 is typically .001-.002 inches, and 0W-20 is .0005-.001 inches. JetDoc is usually spot on but he misses just a bit with this one - my 2010 Prius uses 0W-20 in all climates (it came from Phoenix, where it used 0W-20 in 117F weather). In any case, your engine was designed for 10W-40.

NO. The engine was designed for 10W40. If you run 0W20 in it, you might save a little on fuel, but will loose a lot of money on trading in a broken car or rebuilding the engine.

0w20 is for extreme cold weather winter conditions... NOT for general purpose use. If the manufacturer recommended 10w40, then that's what you should use. Anything lighter than that won't maintain a proper oil film around your bearings and will promote rapid wear and failure of your engine.

If you want your car to last use the correct grade of oil. If your mechanic is not using the correct grade find a decent mechanic to do your work.

Use 5w-40 fully synthetic. 0w-20 will not protect at high engine temperature.

0W20 is nowhere near the spec of 10W40 so not use the correct oil for the best outcomes

can i use 0w20 oil in my KIA sephia 1995 1.5cc 16v

the car has a new engine (clean)

the mechanic puts 20w50 for it and i know its not good

im willing to use 0w20 is there anything i should know

the recommended oil for my engine in the 1995 is 10w40 put im sure things changed