30 is a little more viscous (thicker) at operating temperature than 20.
Hi, Which engine is it, 2.7L - 5w20. 5.7L - 5w20/Mobil - 5w40
Both behave the same when cold but the 5W30 is slightly more viscous at high (engine operating) temperature.
5w20 or 5w30 up to 100,000 miles.
The 3.8L engine holds five quarts of 5W20 engine oil.
Check the oil fill cap, it should require 5w20.Check the oil fill cap, it should require 5w20.
2005 Mazda 6s, ( V6, 3.0) takes 6 US quarts if you change the oil filter..5.5 quarts if you don't change the filter. Recommended oil is SAE 5W20. The four cylinder (2.5 liter engine) takes 4.5 us quarts if you change the filter and 4.1 us quarts if you don't change the oil filter. They both use the same viscosity of oil because of the vast temperature range of the 5W20 grade oil.