Oils

Can you always use a higher API S code?
Is API SN higher than sh?Is API SN better than SL?Can I use API SN instead of SG?What is the difference between API SM and API SN?What is API SN?What ...
5W 30 ACEA C3 engine oil when 5W 30 ACEA C4 engine oil reccomended
Can I use C3 oil instead of C4?Does it matter what 5w30 oil I use?What is ACEA C4 oil?Are all C3 oils the same?Is C3 or C4 oil better?Is C3 oil better...
Why are recommended oil weights lower for many newer cars?
Why? Lower-viscosity oils reduce internal friction since they flow more easily than higher-viscosity oils, improving fuel economy. With fuel-economy s...
C Grade engine oil in petrol / gas engine
What is C rated oil?Can I use C3 oil in a petrol engine?Which is better C2 or C3 oil?What is the difference between C1 and C3 oil?What engine oil is t...